Books with 1 to 2 Authors/Editors:
Bollet, A.J. (2002). Civil war medicine: Challenges and triumphs. Tucson, AZ: Galen Press.
Frumkin, H. (Ed.). (2005). Environmental health: From global to local. San Francisco, CA: Jossey-Bass.
Citing More Than One Resource at a Time:
When citing more than one resource at the same spot in the text, separate the citations with a semicolon. For example:
(Bollet, 2002; Frumkin, 2005)
Books with 3 to 7 Authors/Editors:
List all authors up to 8 authors.
Kaplan, C., Turner, G.S., & Warrell, D.A. (1986). Rabies: The facts. New York: Oxford University Press.
Bartlett, J. D., Jaanus, S. D., Fiscella, R. G., Holdeman, N. R., & Propkopich, C. L. (Eds.). (2008). Clinical ocular pharmacology. St. Louis, MO: Butterworth-Heinemann.
For 3 to 5 authors, list all authors for the 1st in text citation; list only the 1st author followed by et al. in all subsequent in text citations.
(Berman, Kotzur, & Oldham, 1986) then (Berman et al., 1986)
(Fellows, Denison, Fiscella, Lenchantin, & Nastanovich, 2008) then (Fellows, et al., 2008)
For 6 or more authors, list only the first author, followed by et al.:
(Berman et al., 1998)
Books with 8 or More Authors/Editors:
List the 6 authors, insert 3 ellipses, and add last author/editor name.
Walsh, D., Caraceni, A.T., Fainsinger, R., Foley, K., Glare, P., Goh, C., ...Radbruch, L. (2008). Palliative medicine. Philadelphia, PA: Saunders Elsevier.
List the 1st author and et al.
(Walsh et al. 2008)
In-text citations of electronic books are formatted like print books (i.e. author, year). If the book is available in print and online, designate what online edition of the book you used.
Ropper, A. H., & Samuels, M. A. (2005). Adams and Victor's Principles of Neurology [Access Medicine version]. Retrieved from http://www.accessmedicine.com/features.aspx
Notice that the home page for Access Medicine is given, not a direct link to the book which would not work outside of the campus ip range. As with e-journals, you should give the publisher or provider's home page for these types of materials.
If there is no print version, you do not need to include the bracketed description ([Access Medicine version]) in the example above.