APA

Hackstaff L., . (1966). Systems of formal logic. Dordrecht-Holland: D. Reidel Pub.

Chicago

Hackstaff L.H, . 1966. Systems of formal logic. Dordrecht-Holland: D. Reidel Pub.

Harvard

Hackstaff L., . (1966). Systems of formal logic. Dordrecht-Holland: D. Reidel Pub.

MLA

Hackstaff L.H, . Systems of formal logic. Dordrecht-Holland: D. Reidel Pub. 1966.