APA (7th ed.) Citation

Drew, D. P., & Smith, D. I. (1969). Techniques for the tracing of subterranean drainage. Geo Abstracts.

Chicago Style (17th ed.) Citation

Drew, David P., and David Ingle Smith. Techniques for the Tracing of Subterranean Drainage. Norwich: Geo Abstracts, 1969.

MLA (9th ed.) Citation

Drew, David P., and David Ingle Smith. Techniques for the Tracing of Subterranean Drainage. Geo Abstracts, 1969.