APA (7th ed.) Citation

Brown, G. I. (1967). A new guide to modern valency theory. Longman.

Chicago Style (17th ed.) Citation

Brown, G. I. A New Guide to Modern Valency Theory. London: Longman, 1967.

MLA (9th ed.) Citation

Brown, G. I. A New Guide to Modern Valency Theory. Longman, 1967.