APA (7th ed.) Citation

Middleton, J. S., & Citrine, W. (1937). Kingsway Hall demonstration on Spain (circular).

Chicago Style (17th ed.) Citation

Middleton, J. S., and Walter Citrine. Kingsway Hall Demonstration on Spain (circular). 1937.

MLA (8th ed.) Citation

Middleton, J. S., and Walter Citrine. Kingsway Hall Demonstration on Spain (circular). 1937.

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