APA is becoming more often used in the engineering classes as a citation style.
Texas Tech has a great guide for the APA Style guide located here.
The biggest thing to remember about citations is that they are based on a pattern. The second biggest thing is that the citation generators, either through the University Libraries or other places will not always give you the correct information. So you should follow the pattern of the citation style and check the ones you copy and paste from the databases against the examples on our pages or within the APA style guide.
From the CEP Reference Style Guide of the AIChE. Their example is a direct pdf that I've placed in my Adobe account and you should be able to see it here: Shared Copy of CEP Guide.
General Style:
Information appears in the following general order: author, title, publisher, page numbers, date. Individual elements of the citation are separated by commas, and a period is used at the end. If there are more than two authors, list only the first author followed by et al. The specific information that should be included depends on the type of reference:
Periodical: Author's last name and initials in bold, title of article in quotation marks, title of periodical in italics (underline if italics are not available), volume number in bold, issue number in parentheses, page numbers (inclusive), date in parentheses.
Pedron, S., et. al., “Synthesis and characterization of degradable bioconjugated hydrogels with hyperbranched multifunctional cross-linkers,” Acta Biomaterialia, 6 (11), pp. 4189-4198 (Nov. 2010).
Book: Author's last name and initials in bold, title of book in quotation marks, edition number if appropriate, publisher's name, city and state of publisher, page numbers (inclusive, unless entire book is being referenced), date in parentheses.
Garner, G. O., “Careers in Engineering,” 2nd ed., VGM Career Books, Chicago, IL (2003).
Other Sample Citations:
Homoki, G. G., and K. N. Vernekar, "Materials Selections for Sludge Incinerator Heat Exchangers," in "Materials Performance in Waste Incineration Systems," G. Y. Lai and G. Sorell, Eds., NACE International, Houston, TX, pp. 20-1 to 20-8 (1992).
Perry, R. H., and D. W. Green, Eds., "Mass Transfer and Gas Absorption," Chapter 14, in "Perry's Chemical Engineers' Handbook," 6th ed., McGraw-Hill, New York (1984).
McLarnon, C. R., and J. L. Duncan, “Testing of Ammonia-Based CO2 Capture with Multi-Pollutant Control Technology,” Proceedings of the 9th International Conference on Greenhouse Gas Control Technologies, Washington, DC (Nov. 16–20, 2008).
U.S. Environmental Protection Agency, "Compiling Air Toxics Emissions Inventories," U.S. EPA, Office of Air Quality Planning and Standards, Research Triangle Park, NC, EPA/450/4-86-010, NTIS No. PB86-238086 (July 1986).
"The Abnormal Situation Management Joint Research and Development Consortium," available via http://www.iac.honeywell.com/Pub/Tech/asmwww/html on the WWW.