APA (7th ed.) Citation

Harmer, A. F., & Dickinson, R. (1977). Problems in chemistry. Longman.

Chicago Style (17th ed.) Citation

Harmer, A. F., and R. Dickinson. Problems in Chemistry. Kuala Lumpur: Longman, 1977.

MLA (9th ed.) Citation

Harmer, A. F., and R. Dickinson. Problems in Chemistry. Longman, 1977.