APA (7th ed.) Citation

Spencer, F. H., & Ogden, R. (1950). Guide to economics: A manual for students (6th ed.). I. Pitman.

Chicago Style (17th ed.) Citation

Spencer, F. H., and Ronald Ogden. Guide to Economics: A Manual for Students. 6th ed. London: I. Pitman, 1950.

MLA (9th ed.) Citation

Spencer, F. H., and Ronald Ogden. Guide to Economics: A Manual for Students. 6th ed. I. Pitman, 1950.