APA (7th ed.) Citation

Freeman, M. H., Hanna, J. M., & Kahn, G. (1968). Source book & key for Accounting 10/12. Gregg.

Chicago Style (17th ed.) Citation

Freeman, M. Herbert, J. Marshall Hanna, and Gilbert Kahn. Source Book & Key for Accounting 10/12. New York: Gregg, 1968.

MLA (9th ed.) Citation

Freeman, M. Herbert, et al. Source Book & Key for Accounting 10/12. Gregg, 1968.