APA-viite

Howells, J. G. (1975). Modern perspectives in the psychiatry of old age. Churchil Livingston.

Chicago-tyylinen lähdeviittaus

Howells, John G. Modern Perspectives in the Psychiatry of Old Age. London: Churchil Livingston, 1975.

MLA-viite

Howells, John G. Modern Perspectives in the Psychiatry of Old Age. Churchil Livingston, 1975.