APA (7e ed.) Bronvermelding

Hannaford, J. (1968). Student's guide to Heilbroner: The economic problem. Prentice-Hall.

Chicago (17e ed.) Bronvermelding

Hannaford, John. Student's Guide to Heilbroner: The Economic Problem. Englewood Cliffs, N.J: Prentice-Hall, 1968.

MLA (9e ed.) Bronvermelding

Hannaford, John. Student's Guide to Heilbroner: The Economic Problem. Prentice-Hall, 1968.