In-text:
McAlmon (1925) stated that in the three decades since New York City's Stonewall rebellion, gay literature has exploded as a distinctive form of cultural expression. ... or at the end of the sentence for example ... In the three decades since New York City's Stonewall rebellion, gay literature has exploded as a distinctive form of cultural expression (McAlmon, 1925).
Reference list:
McAlmon, R. “Miss Knight”. (1925) The Columbia Anthology of Gay Literature: Readings from Western Antiquity to the Present Day. Ed. Byrne R.S. Fone. New York: Columbia UP, 1998, pp. 629-39. Print.