This guide is designed to be a learning tool. It does not substitute for the Publication Manual OR your instructor's requirements.
The 6th edition of the Publication Manual requires that the name of the state, province, or country be included with all citations in the reference list.
According to the 6th edition of the Publication Manual:
If your source has one to seven authors, list the names of all authors.
If your source has eight or more authors, list the names of the first six authors. After the name of the sixth author, use an ellipsis (three periods), then list the name of the last author.
Visioli, F., Bernhaert, H., Corti, R., Ferri, C., Heptinstall, S.,
Molinari, E., . . . Paoletti, R. (2009). Chocolate, lifestyle, and health.
Critical Reviews in Food Science and Nutrition, 49, 299-312.