APA-viite

Worrel, A. C. (1970). Principles of forest policy. Mc Graw Hill Book company.

Chicago-tyylinen lähdeviittaus

Worrel, A C. Principles of Forest Policy. NewYork: Mc Graw Hill Book company, 1970.

MLA-viite

Worrel, A C. Principles of Forest Policy. Mc Graw Hill Book company, 1970.