Citazione Stile APA (7a Edizione)

O'Brien, R. A., & Collins, D. C. (1991). Forest statistics for land outside national forests in West-Central Montana, 1989. Intermountain Research Station.

Citazione stile Chigago Style (17a edizione)

O'Brien, Renee A., e Dennis C. Collins. Forest Statistics for Land Outside National Forests in West-Central Montana, 1989. Ogden: Intermountain Research Station, 1991.

Citatione MLA (9a ed.)

O'Brien, Renee A., e Dennis C. Collins. Forest Statistics for Land Outside National Forests in West-Central Montana, 1989. Intermountain Research Station, 1991.