APA (7th ed.) Citation

Open University, English Language Book Society, Smith, P. J., Wilson, R. C. L., & Gass, I. G. (1972). Understanding the earth: A reader in the earth sciences (2nd ed.). Artemis Press for the Open University and the English Language Book Society.

Chicago Style (17th ed.) Citation

Open University, English Language Book Society, Peter J. Smith, R. C. L. Wilson, and I. G. Gass. Understanding the Earth: A Reader in the Earth Sciences. 2nd ed. Sussex: Artemis Press for the Open University and the English Language Book Society, 1972.

MLA (9th ed.) Citation

Open University, et al. Understanding the Earth: A Reader in the Earth Sciences. 2nd ed. Artemis Press for the Open University and the English Language Book Society, 1972.