APA
Richards L. A. (., series, . (1969). Diagnosis & improvement of saline & alkali soils. Washington, DC: United States Department of Agriculture.
Chicago
Richards L A (ed), series, . 1969. Diagnosis & improvement of saline & alkali soils. Washington, DC: United States Department of Agriculture.
Harvard
Richards L. A. (., series, . (1969). Diagnosis & improvement of saline & alkali soils. Washington, DC: United States Department of Agriculture.
MLA
Richards L A (ed), series, . Diagnosis & improvement of saline & alkali soils. Washington, DC: United States Department of Agriculture. 1969.