APA (7th ed.) Citation

Field, B. C., & Willis, C. E. (1979). Environmental economics: A guide to information sources. Gale Research.

Chicago Style (17th ed.) Citation

Field, Barry C., and Cleve E. Willis. Environmental Economics: A Guide to Information Sources. Detroit: Gale Research, 1979.

MLA (9th ed.) Citation

Field, Barry C., and Cleve E. Willis. Environmental Economics: A Guide to Information Sources. Gale Research, 1979.