APA

(1974). Irregular Serials and Annuals an International Directory. 1974-1975. New York: R. R. Bowker Company.

Chicago

1974. Irregular Serials and Annuals an International Directory. 1974-1975. New York: R. R. Bowker Company.

Harvard

(1974). Irregular Serials and Annuals an International Directory. 1974-1975. New York: R. R. Bowker Company.

MLA

Irregular Serials and Annuals an International Directory. 1974-1975. New York: R. R. Bowker Company. 1974.