APA (7th ed.) Citation

Hackstaff, L. H. (1967). Systems of formal logic. D. Reidel.

Chicago Style (17th ed.) Citation

Hackstaff, L. H. Systems of Formal Logic. Dordrecht: D. Reidel, 1967.

MLA (9th ed.) Citation

Hackstaff, L. H. Systems of Formal Logic. D. Reidel, 1967.

Warning: These citations may not always be 100% accurate.