Bulletin catalog : : 1939 through 1973.

MLA

Bulletin Catalog : 1939 Through 1973. New York: SWP, 1974.

APA

(1974). Bulletin catalog : 1939 through 1973. New York: SWP.

Chicago

Bulletin Catalog: 1939 Through 1973. New York: SWP, 1974.