Παραπομπή APA

Andreasen, G. (1963). In twenty years: Our common future. Popular Prakashan.

Παραπομπή Chicago Style

Andreasen, Gunnar. In Twenty Years: Our Common Future. Bombay: Popular Prakashan, 1963.

Παραπομπή MLA

Andreasen, Gunnar. In Twenty Years: Our Common Future. Popular Prakashan, 1963.