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Purdue Online Writing Lab

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The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material as a free service of the Writing Lab at Purdue. Students, members of the community, and users worldwide are welcome to use OWL for information to assist with writing projects. 

OWL has extensive examples, explanations and tutorials on all citation styles, including APA, MLA and Chicago.  If you have a citation question, it's almost certain you'll find your answer on OWL.

American Mathematical Society (AMS)

In text Reference example:  

[3]  - With AMS in-text citations, the # sign corresponds to the author listed alphabetically in the references at end of article.

References (list at END of paper, with citations alphabetical by AUTHOR):

Journal Article (one author):
[3] S. Dostoglou, S.: On the asymptotics of the finite energy solutions of the Yang-Mills-Higgs equations, Journal of Mathematical Physics31, 2490-2496 (1990). 

Journal Article (multiple authors):
[2] S. Carstensen, E.P. Stephan, Adaptive boundary-element methods for transmissions problems, Journal of Mathematical Analysis and Applications106, 367-413 (1985).

Book (one author):

[1] C.P. Bruter, Mathematics and Art, Springer, Paris, 2002.

Book (multiple authors):

[4] N. Lesmoir-Gordon, M, Frame, B. Mandelbrot, N. Neger, Mandelbrot's World of Fractals, Key Curriculum Press, 2005.

Web Page:
[5] G.P. Michon. Final answers: Perimeter of an ellipse (updated May 17, 2011)

Chicago Citations

Citation Management System - Zotero