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Consider appending the following abbreviations to the ISBN in order to generate unique proprietary IDs:
formatFormat | abbreviationAbbreviation |
Hardcover | HC |
Reinforced book | RB |
Unsewn book | UNS |
Sewn book | SWN |
Saddle-sewn book | SDL |
Boardbook | BB |
Paperback | PBK |
CD-Audio | CD |
ePub | EPB |
Hosted ebook | H |
Kindle | K |
Mass market paperback | MM |
iBook | I |
ePIB | EPIB |
Hosted ibook | HI |
Digital Database | DB |
eBoost | BST |
Read-along ePub | EPBA |
Bundle | B |
Spiral-bound book | SPRL |
Other | OTH |
MP3 audio | MP3 |
WAV audio | WAV |
Multi-format | MUL |