Cita APA (7a ed.)

Troyer, W. (1990). Preserving our world: A consumer's guide to the Brundtland report. Warglen International Communications Inc.

Cita Chicago Style (17a ed.)

Troyer, Warner. Preserving Our World: A Consumer's Guide to the Brundtland Report. [Canada?]: Warglen International Communications Inc, 1990.

Cita MLA (9a ed.)

Troyer, Warner. Preserving Our World: A Consumer's Guide to the Brundtland Report. Warglen International Communications Inc, 1990.