MLA

Clark, and Margaret R Haswell. The Economics of Subsistence Agriculture. Palgrave Macmillan UK, 1970.

APA

Clark, C., & Haswell, M. R. (1970). The Economics of Subsistence Agriculture. Palgrave Macmillan UK.

Chicago

Clark, and Margaret R Haswell. The Economics of Subsistence Agriculture. : Palgrave Macmillan UK, 1970.