I have been trying to modify existing biblatex styles to match the PNAS citation guidelines and I have an issue with the title delimiter.

PNAS expects book and collection citations to be of this format:

Doe J (<year>) \emph{<booktitle>} (<publisher>: <address>).

And journal articles of this format:

Doe J (<year>) <title>. \emph{<journaltitle>} <volume>(<number>):<pagerange>.

I have managed to achieve most of this with the help Barbara Beeton, percusse and other gurus.

But I haven't figured out how to have journal titles followed by period+space and book/collection titles only by space.

This is what I have so far:


Apologetically, I am offering a rather long (M)WE containing all the changes I have made so far to achieve this outcome. I do this to avoid a conflict between what I already changed and the solution you suggest.

Also, since I am a n00b, please do let me know if I have any silly mistakes in the modifications I have made.



  title           = {Phenotypic Plasticity in the Interactions and Evolution of Species},
  author          = {Agrawal, Anurag A.},
  journal         = {Science},
  year            = {2001},
  month           = oct,
  volume          = {294},
  number          = {5541},
  pages           = {321--326},

  title           = {On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Species in the Struggle for Life},
  author          = {Darwin, Charles},
  publisher       = {John Murray},
  address         = {London},
  year            = {1859},



%% =============================================================================
%% PNAS Style
%% =============================================================================
  \AtEveryBibitem{\clearfield{month}} % Do not show month in bibliography.
  \AtEveryCitekey{\clearfield{month}} % Do not show month in citations.

  % Comma-separated authors, last then first name.

  % No quotes or italics in titles, except books and collections in italics.

  % Journal titles in italics.

  % Print publisher, then location, separated by comma in parentheses.

  % Remove "in:" for article entries.

  % Remove page prefixes.

  % Print volume, followed by number in parentheses.

  % Colon for volume(number):pages delimiter.

  % Add labelnumbers to bibliography.

  % Omit authoryear disambiguation.


therefor you have to modify the bibdriver for the entrytype book in standard.bbx. You can easily exchange parts from macros, especially biblatex-macros, with the package xpatch.

Add the following lines to your preamble, it will exchange the first string with the second - which will replace the default unit at this time for one time with a space character.

  • btw. it's easier if you write the wanted format like: Doe J (year) booktitle (publisher: address). - much easier to read.
    – musicman
    May 29 '14 at 5:46
  • @sudosensei, would you mind sharing you the biblatex PNAS style, if you have it working?
    – vancleve
    Feb 20 '15 at 19:48

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