APA (7th ed.) Citation

Manuel, A. D. 1. t. 1., Manuel, A. D., & Gustafson, R. H. (1968). Three land research studies. U. S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Manuel, Allen D. 1956 to 1966, Allen D. Manuel, and Robert H. Gustafson. Three Land Research Studies. Washington, D. C: U. S. Govt. Print. Off, 1968.

MLA (9th ed.) Citation

Manuel, Allen D. 1956 to 1966, et al. Three Land Research Studies. U. S. Govt. Print. Off, 1968.