APA-referens

Heal, O. W., & Perkins, D. F. (1978). Production ecology of British moors and montane grasslands. Springer-Verlag.

Chicago-stil citat

Heal, O W., och D F. Perkins. Production Ecology of British Moors and Montane Grasslands. Berlin: Springer-Verlag, 1978.

MLA-referens

Heal, O W., och D F. Perkins. Production Ecology of British Moors and Montane Grasslands. Springer-Verlag, 1978.