Gaya APA

Schofield, E, A., Novick, P, M, G, A, A, B. (1978). Earthcare: Global Protection Of Natural Areas . Amerika Serikat: Cooperation With The Sierra Club.

Gaya MLA

Schofield, Edmund, A.., Novick, Paul, M., Glassner, And, Allan, B.. "Earthcare: Global Protection Of Natural Areas". Amerika Serikat: Cooperation With The Sierra Club, 1978. Text.