My main `zeros' reference (just because it is something that does the job,
and that I am familiar with) is:
<br>
[M91] P Martin, Potts models and related problems in statistical mechanics,
World Scientific 1991.
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General (exact) stat mech references:
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[B82] R J Baxter, Exactly solved models in statistical mechanics, Academic 1982.
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[H61] D ter Haar, Elements of statistical mechanics, Holt Rinehart Winston 1961.
(Chapter 12: Cooperative phenomena).
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[M03]
<a href="http://books.google.co.uk/books?id=Td1pIUnvUe0C&pg=PA216&lpg=PA216&dq=statistical+mechanics+transfer+matrix+potts&source=web&ots=-JWRRPEibq&sig=6f00Emnbbxb1xlnSnQqXDnF4Zxk&hl=en&sa=X&oi=book_result&resnum=3&ct=result">D C Mattis, 
Statistical Mechanics Made Simple, World Scientific 2003.</a>
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<br>
Some (for me) key Papers on zeros:
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[F64] M E Fisher, in Lectures in theoretical physics Vol.7c,
U. Colorado Press 1964, p.1.
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[A70] Y Abe and A Katsura, Prog Theor Phys 43 (1970) 1402.
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[P82] R B Pearson, Phys Rev B26 (1982) 6285.
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[M83] P P Martin, Nucl Phys B225[FS9] (1983) 497.
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Others:
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[OBB94] M. J. O'Rourke, R. J. Baxter and V. V. Bazhanov,
 Numerical results for the three-state critical Potts model on finite rectangular lattices,
J Stat Phys 78 (1995) 665. <a href="http://www.springerlink.com/content/b031671m6u0u26g2/"> HERE </a>
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<br><br>
Live link version of the Bibliography to [M91] (work in progress):
<br>
[A67] R Abe, Prog Theor Phys 38 (1967) 322.
<br> 
[HKW78] <a href="http://www.springerlink.com/content/mn286u90g5n32188/">
A. Hintermann, H. Kunz and F. Y. Wu, Journal of Statistical Physics 19 (1978) 623. </a> 
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[M88] P P Martin, J Phys A 21 (1988) 4415.
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[M86] P P Martin, J Phys A 19 (1986) 3267.
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[MM86] P P Martin and J M Maillard, J Phys A 19 (1986) L547.
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[M83a] P P Martin, Nucl Phys B220 [FS8] (1983) 366.
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<br><br>
Other interesting stuff:
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[GL08] Joseph Geraci and Daniel A. Lidar,
On the Exact Evaluation of Certain Instances of the Potts Partition Function by Quantum Computers
,
CMP 279 (2008) 735. <a href="http://www.springerlink.com/content/?Author=Joseph+Geraci"> HERE </a>
<br>