APA (7th ed.) Citation

Boyd, E. N. (1972). A diagnostic study of students' difficulties in general mathematics in first year college work (Repr. d. Ausg. New York 1940.). AMS Press.

Chicago Style (17th ed.) Citation

Boyd, Elizabeth Nicely. A Diagnostic Study of Students' Difficulties in General Mathematics in First Year College Work. Repr. d. Ausg. New York 1940. New York: AMS Press, 1972.

MLA (9th ed.) Citation

Boyd, Elizabeth Nicely. A Diagnostic Study of Students' Difficulties in General Mathematics in First Year College Work. Repr. d. Ausg. New York 1940. AMS Press, 1972.