APA

Prior A. N., . (1955). Formal logic. Oxford: Clarendon Press.

Chicago

Prior Arthur N, . 1955. Formal logic. Oxford: Clarendon Press.

Harvard

Prior A. N., . (1955). Formal logic. Oxford: Clarendon Press.

MLA

Prior Arthur N, . Formal logic. Oxford: Clarendon Press. 1955.