Παραπομπή APA

Silva, M. e. (1972). 1973 Britannica yearbooks of science and the future. Encyclopaedia Britannica.

Παραπομπή Chicago Style

Silva, Michel ed. 1973 Britannica Yearbooks of Science and the Future. Chicago: Encyclopaedia Britannica, 1972.

Παραπομπή MLA

Silva, Michel ed. 1973 Britannica Yearbooks of Science and the Future. Encyclopaedia Britannica, 1972.