APA (7th ed.) Citation

Strain, B. R., & Billings, W. D. (1974). Vegetation and environment. W. Junk.

Chicago Style (17th ed.) Citation

Strain, B. R., and W. D. Billings. Vegetation and Environment. The Hague: W. Junk, 1974.

MLA (9th ed.) Citation

Strain, B. R., and W. D. Billings. Vegetation and Environment. W. Junk, 1974.