APA-referens (7:e uppl.)

Pegrum, D. F. (1963). Transportation: Economics and public policy. Irwin.

Chicago-referens (17:e uppl.)

Pegrum, Dudley Frank. Transportation: Economics and Public Policy. Homewood, Ill: Irwin, 1963.

MLA-referens (9:e uppl.)

Pegrum, Dudley Frank. Transportation: Economics and Public Policy. Irwin, 1963.