APA Style

Pei, Mario. ([1973]). How to learn languages and what languages to learn (Enl. ed.). nyu: Harper & Row.

Chicago Style

Pei, Mario. How to learn languages and what languages to learn. Enl. ed. nyu: Harper & Row, [1973]. print.

MLA Style

Pei, Mario. How to learn languages and what languages to learn. Enl. ed. nyu: Harper & Row, [1973]. print.

Turabian Style

Pei, Mario. How to learn languages and what languages to learn. Enl. ed. nyu: Harper & Row, [1973]. print.