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The first time I typeset this I get ?? for the ref. The second time, it is blank. I am using TeXShop. I set out to make an example that uses biblatex to get a list of references for each chapter and another list at the end of the book. It makes the reference lists OK, but not the ref marks. What is wrong?

documentclass[nobib]{tufte-book}

usepackage[

  style=authoryear,

  autocite=footnote,

  backend=biber,

  natbib=true

]{biblatex}

addbibresource{references.bib}



begin{document}

begin{refsection}

 chapter{First chapter}label{ch01}

 section{Foo}label{ch01:sec01}

 Some text citep{Duffie:96}.

 section{Bee}

 Refer to ref{ch01:sec01} of chapter ref{ch01}.

printbibliography[heading=subbibliography]

end{refsection}



 begin{refsection}

 chapter{Second chapter}

 section{Bar}

 Some textautocite{Eason1999}. 

 Remember section ref{ch01:sec01} of chapter ref{ch01} down here.

 printbibliography[heading=subbibliography]

 end{refsection}



chapter{Later}

This,autocite{hashemian} should be a side note but not this citep{hashemian}.

printbibliography 



end{document}

Here is references.bib:

%% This BibTeX bibliography file was created using BibDesk.

%% http://bibdesk.sourceforge.net/





%% Created for Sam Cox at 2016-02-17 17:46:29 -0500 





%% Saved with string encoding Unicode (UTF-8) 







@book{Duffie:96,

    Address = {Princeton, NJ 08540},

    Author = {Duffie, J. Darrell},

    Date-Added = {2016-02-17 22:36:09 +0000},

    Date-Modified = {2016-02-17 22:36:09 +0000},

    Edition = {2nd},

    Publisher = {Princeton University Press},

    Title = {Dynamic Asset Pricing Theory},

    Year = {1996}}



@article{Eason1999,

    Author = {Eason, Stephen W. and Hirst, Brian L. and Vukelic, Milan},

    Date-Added = {2016-02-17 22:35:52 +0000},

    Date-Modified = {2016-02-17 22:35:52 +0000},

    Journal = {Record of the Society of Actuaries},

    Number = {3},

    Pages = {1--20},

    Title = {Security Blanket for Life (and Health)},

    Volume = {25},

    Year = {1999}}



@book{childs_temperature,

    Address = {Great Britain},

    Author = {Childs, Peter R N},

    Edition = {1},

    Isbn = {0 7506 5080 X},

    Publisher = {Butterworth - Heinemann},

    Title = {Practical Temperature Measurement},

    Year = {2001}}



@phdthesis{hashemian,

    Author = {Hashemian, Hashem Mehrdad},

    School = {{The University of Western Ontario}},

    Title = {Measurements of dynamic temperatures and pressures in nuclear power plants},

    Type = {PhD {T}hesis},

    Year = {2011}}

The chapter and section headings are unnumbered in the tufte-book document class. Since ref wants to print the chapter/section number and can't find it, it complains in the log file:

Package hyperref Warning: Suppressing empty link on input line 18.

If you turn on the chapter and section numbering (by adding setcounter{secnumdepth}{1} to the preamble of your document), it should fix the problem.

Note, however, that the headings in the tufte-book aren't designed to print the numbering nicely by default, so you may need to fiddle with the formatting a little bit.

As an alternative, you might consider using nameref instead of ref to print the name of the chapter/section instead of the number.

Thank you Godbyk, you just made my day! Woohoo.