APA (7e ed.) Bronvermelding

Northwestern University (Evanston, Ill.), & Gregory, H. H. (1968). Learning theory and stuttering therapy. Northwestern University Press.

Chicago (17e ed.) Bronvermelding

Northwestern University (Evanston, Ill.), en Hugo H. Gregory. Learning Theory and Stuttering Therapy. Evanston [Ill.]: Northwestern University Press, 1968.

MLA (9e ed.) Bronvermelding

Northwestern University (Evanston, Ill.), en Hugo H. Gregory. Learning Theory and Stuttering Therapy. Northwestern University Press, 1968.