APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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