APA-referens (7:e uppl.)

Koch, A. R. (1986). Economic principles: Growth and environment. Avi.

Chicago-referens (17:e uppl.)

Koch, A. Robert. Economic Principles: Growth and Environment. Westport, Conn.: Avi, 1986.

MLA-referens (9:e uppl.)

Koch, A. Robert. Economic Principles: Growth and Environment. Avi, 1986.