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Citing multiple authors and works

Two or three authors

Include all of their names in each citation:

(Kelly, Colter, and Lane 1980)

Four or more authors

Use only the first author's name and "et al." in all citations, including the first.

(Angel et al. 1986)

Different authors and years

Arrange the citations in alphabetical order by first author, rather than in chronological order.

Separate the items with semicolons:

(Confucius 1951; Gurdjieff 1950; Wanisaburo 1926)

By same author in same year

Assign a lowercase letter to the year of publication (in alphabetical order by title), and use the same letters in the reference list.

(Frankly 1957a, 1957b)