Gaya APA

Swanson, C, P., J., I, G, N. (NULL). New Unesco source book for geography teaching . Paris:: Paris: Longman/the Unesco; 1982.

Gaya MLA

Swanson, Carl, P.., J., I., Graves,, Norman. "New Unesco source book for geography teaching". Paris:: Paris: Longman/the Unesco; 1982, NULL. Text.