Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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