1. Three to twenty authors

Author #1's Last Name, Initial, Author #2's Last Name, Initial, Author #3's Last Name,  Initial, Author #4's Last Name, Initial, Author #5's Last Name, Initial, Author #6's Last Name, Initial, Author #7's Last Name, Initial, Author #8's Last Name, Initial, Author #9's Last Name, Initial, Author #10's Last Name, Initial, Author #11's Last Name, Initial, Author #12's Last Name, Initial, Author #13's Last Name, Initial,Author #14's Last Name, Initial, Author #15's Last Name, Initial, Author #16's Last Name, Initial, Author #17's Last Name, Initial, Author #18's Last Name, Initial, Author #19's Last Name, Initial & Author #20's Last Name, Initial*. (Year of publication). Title of Book. Publisher.

*Provides surnames and initials for up to and including twenty authors. Before the last author name, put an ampersand (&).

e.g. Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., Iredell, M., Saha, S., White, G., Woollen. J., Zhu, Y., Chelliah, M., Ebisuzaki, W., Higgins, W., Janowiak, J., Mo, K.C., Ropelewski, C., Wang, J., Leetmaa, A., & Joseph, D. (1996). 

2. Twenty-one or more authors

Author #1's Last Name, Initial, Author #2's Last Name, Initial, Author #3's Last Name, Initial, Author #4's Last Name, Initial, Author #5's Last Name, Initial, Author #6's Last Name, Initial, Author #7's Last Name, Initial, Author #8's Last Name, Initial, Author #9's Last Name, Initial, Author #10's Last Name, Initial, Author #11's Last Name, Initial, Author #12's Last Name, Initial, Author #13's Last Name, Initial,Author #14's Last Name, Initial, Author #15's Last Name, Initial, Author #16's Last Name, Initial, Author #17's Last Name, Initial, Author #18's Last Name, Initial, Author #19's Last Name, Initial,... Last Author Last Name, Initial*. (Year of publication). Title of Book. Publisher.

* Include the first 19 authors's name, insert an ellipsis (...) , then add the last author's name.

e.g. Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., Iredell, M., Saha, S., White, G., Woollen. J., Zhu, Y., Chelliah, M., Ebisuzaki, W., Higgins, W., Janowiak, J., Mo, K.C., Ropelewski, C., Wang, J., Leetmaa, A., ... Joseph, D. (1996).