There are many style guides available. When working on your bibliographies, follow your professor's, editor's, or journal's instructions first. If they have none, you can choose one of the styles below. ACS (American Chemical Society) and AIP (American Institute of Physics) have more technical examples and are used more in engineering than APA (American Psychological Asssociation), Chicago, MLA (Modern Languages Association), and Turabian.

ACS Style Guide - (Engineering Library Ref Handbooks PE1478 .A18 1986 )
Published by the American Chemical Society, the ACS Style Guide contains many useful scientific examples

AIP Style Manual (Engineering Library QC5.45 .A51 1990 ) Published by the American Institute of Physics.

Lehigh University's Citation Web Pages, listed by engineering discipline.

Duke University's Citing Sources. Has good comparison tables on APA, Chicago, MLA, and Turabian, styles used by humanists and social scientists.

AICHE CEP Reference Style

ASCE Online Author's Guide

ASME - Author Kit to Publishing in a ASME journal

Communications of the ACM - Information for Authors

Bibliographic Formats for Citing Electronic Information - how to cite web sites, email, discussion groups, etc.

Columbia University Press Guide to Online Style - compares scientific and humanities style for each entry

IEEE Information for Authors

Metallurgical and Materials Transactions Instructions for Authors

Physical Review style (APS journals)