APA Citatie

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

Chicago Style citaat

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

MLA citatie

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