APA (7th ed.) Citation

Blackett, P. M. S. (1970). The gap widens. Cambridge U.P..

Chicago Style (17th ed.) Citation

Blackett, P. M. S. The Gap Widens. London: Cambridge U.P., 1970.

MLA (8th ed.) Citation

Blackett, P. M. S. The Gap Widens. Cambridge U.P., 1970.

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