APA (7th ed.) Citation

Macgregor, J. M. (1969). Six gates from limbo. Avon Books.

Chicago Style (17th ed.) Citation

Macgregor, James Murdoch. Six Gates from Limbo. New York: Avon Books, 1969.

MLA (9th ed.) Citation

Macgregor, James Murdoch. Six Gates from Limbo. Avon Books, 1969.