Dyfyniad APA

JEFFREY, R. C. (1967). Formal logic: Its scope and limits. McGraw-Hill.

Dyfyniad Arddull Chicago

JEFFREY, Richard C. Formal Logic: Its Scope and Limits. New York: McGraw-Hill, 1967.

Dyfyniad MLA

JEFFREY, Richard C. Formal Logic: Its Scope and Limits. McGraw-Hill, 1967.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.