APA-viite

Tolfree, W. R. (1971). Notes on economic theory. Pitman Publishing.

Chicago-tyylinen lähdeviittaus

Tolfree, W. Reay. Notes on Economic Theory. London: Pitman Publishing, 1971.

MLA-viite

Tolfree, W. Reay. Notes on Economic Theory. Pitman Publishing, 1971.