APA

International Congress of the P.E.N. Clubs, International Congress of the P.E.N. Clubs & International Congress of the P.E.N. Clubs. (1968). The writer as independent spirit: proceedings. New York: .

Chicago

International Congress of the P.E.N. Clubs, International Congress of the P.E.N. Clubs and International Congress of the P.E.N. Clubs. 1968. The writer as independent spirit: proceedings. New York: .

Harvard

International Congress of the P.E.N. Clubs, International Congress of the P.E.N. Clubs and International Congress of the P.E.N. Clubs. (1968). The writer as independent spirit: proceedings. New York: .

MLA

International Congress of the P.E.N. Clubs, International Congress of the P.E.N. Clubs and International Congress of the P.E.N. Clubs. The writer as independent spirit: proceedings. New York: . 1968.