APA-referens (7:e uppl.)

Hubbard, G. H. (1901). The why of poverty. Abbey Press.

Chicago-referens (17:e uppl.)

Hubbard, George Henry. The Why of Poverty. New York: Abbey Press, 1901.

MLA-referens (8:e uppl.)

Hubbard, George Henry. The Why of Poverty. Abbey Press, 1901.