Παραπομπή APA

Young, R. G. e. (1969). 1970 Britannica yearbooks of science and the future. Encyclopaedia Britannica.

Παραπομπή Chicago Style

Young, Richard G ed. 1970 Britannica Yearbooks of Science and the Future. Chicago: Encyclopaedia Britannica, 1969.

Παραπομπή MLA

Young, Richard G ed. 1970 Britannica Yearbooks of Science and the Future. Encyclopaedia Britannica, 1969.