APA (7th ed.) Citation

Drummond-Wolff, H. (1959). The rule of reciprocity.

Chicago Style (17th ed.) Citation

Drummond-Wolff, Henry. The Rule of Reciprocity. Montreal, Canada, 1959.

MLA (8th ed.) Citation

Drummond-Wolff, Henry. The Rule of Reciprocity. 1959.

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