Gaya APA

Yuster, L, C. (1986). Ulrich`s international periodicals directory : a classified guide to current periodicals, foreign and domestic 1986-1987 . New York: Bowker.

Gaya MLA

Yuster, Leigh, Carol. "Ulrich`s international periodicals directory : a classified guide to current periodicals, foreign and domestic 1986-1987". New York: Bowker, 1986. Text.