MLA

Kay, Stanley R. Positive and Negative Syndromes In Schizophrenia : Assessment and Research. New York: Brunner and Mazel, 1991.

APA

Kay, S. R. (1991). Positive and negative syndromes in schizophrenia : assessment and research. New York: Brunner and Mazel.

Chicago

Kay, Stanley R. Positive and Negative Syndromes In Schizophrenia: Assessment and Research. New York: Brunner and Mazel, 1991.