APA (7th ed.) Citation

Duffy, H. (1933). Seven by seven. Victor Gollancz.

Chicago Style (17th ed.) Citation

Duffy, Hans. Seven by Seven. London: Victor Gollancz, 1933.

MLA (8th ed.) Citation

Duffy, Hans. Seven by Seven. Victor Gollancz, 1933.

Warning: These citations may not always be 100% accurate.