North American Product Classification System (NAPCS) Canada [Provisional Version 0.1]

• 512 - Internet, software and other computer related services
• 519011 - Internet publishing and broadcasting services

519011.26 - General reference books in electronic and other media

Books published and stored in a physical media including, but not limited to, CD-ROM, diskette, audio cassette, and microform, to be primarily used for general reference purposes and aimed at the public at large, e.g. dictionaries, encyclopaedias, thesauruses, atlases.