Cita APA (7a ed.)

Yip, G. S. (1984). Barriers to entry: A corporate-strategy perspective (2nd printing.). Lexington Books.

Cita Chicago Style (17a ed.)

Yip, George S. Barriers to Entry: A Corporate-strategy Perspective. 2nd printing. Lexington, Massachusetts [etc.]: Lexington Books, 1984.

Cita MLA (9a ed.)

Yip, George S. Barriers to Entry: A Corporate-strategy Perspective. 2nd printing. Lexington Books, 1984.