Παραπομπή APA

Smith, R. J. (1950). Tree crops: A permanent agriculture. Dovin-Adair Co.

Παραπομπή Chicago Style

Smith, Russell J. Tree Crops: A Permanent Agriculture. U S A: Dovin-Adair Co, 1950.

Παραπομπή MLA

Smith, Russell J. Tree Crops: A Permanent Agriculture. Dovin-Adair Co, 1950.