APA (7th ed.) Citation

Barnhart, C. L., Steinmetz, S., & Barnhart, R. K. (1973). The Barnhart dictionary of new English 1963-1972. Longman.

Chicago Style (17th ed.) Citation

Barnhart, Clarence Lewis, Sol Steinmetz, and Robert K. Barnhart. The Barnhart Dictionary of New English 1963-1972. London: Longman, 1973.

MLA (9th ed.) Citation

Barnhart, Clarence Lewis, et al. The Barnhart Dictionary of New English 1963-1972. Longman, 1973.