APA-čujuhus (7. p.)
ebrary, Inc, & Hagen, O. A. (2010). Digital books: Competition and commerce. Nova Science Publishers.
Chicago-čujuhus (17. p.)
ebrary, Inc, juo Oliver A. Hagen. Digital Books: Competition and Commerce. [Hauppauge, N.Y.]: Nova Science Publishers, 2010.
MLA-čujuhus (9. p.)
ebrary, Inc, juo Oliver A. Hagen. Digital Books: Competition and Commerce. Nova Science Publishers, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.