APA

Beth E. W., . (1970). Aspects of modern logic. Dordrecht: Reidel.

Chicago

Beth Evert W, . 1970. Aspects of modern logic. Dordrecht: Reidel.

Harvard

Beth E. W., . (1970). Aspects of modern logic. Dordrecht: Reidel.

MLA

Beth Evert W, . Aspects of modern logic. Dordrecht: Reidel. 1970.