APA

Thomson A. A., Cary F. L., . (1951). But once a year. London: H. Jenkins.

Chicago

Thomson A A, Cary F L, . 1951. But once a year. London: H. Jenkins.

Harvard

Thomson A. A., Cary F. L., . (1951). But once a year. London: H. Jenkins.

MLA

Thomson A A, Cary F L, . But once a year. London: H. Jenkins. 1951.