Citazione Stile APA (7a Edizione)

Dittmann, H., & Hardy, J. (2007). Learn Library of Congress classification (2nd North American ed.). TotalRecall Publications, Inc..

Citazione stile Chigago Style (17a edizione)

Dittmann, Helena, e Jane Hardy. Learn Library of Congress Classification. 2nd North American ed. Friendswood, Tex: TotalRecall Publications, Inc., 2007.

Citatione MLA (9a ed.)

Dittmann, Helena, e Jane Hardy. Learn Library of Congress Classification. 2nd North American ed. TotalRecall Publications, Inc., 2007.