The Second Time You Cite a Publication with Four Authors

Multiple Choice

The second time you cite a publication with four authors in your report,what should be included in the citation?​

A) ​all four authors' names and the date
B) the first author's last name followed by et al. and the date
C) the first author's last name followed by op. cit. and the date"
D) the first two authors' last names and the date