Peter Riley. (2005). Checkpoint Biology Pupil's Book (Checkpoint Science). "Trans-Atlantic Publications, Inc.".
Chicago-čujuhus (17. p.)Peter Riley. Checkpoint Biology Pupil's Book (Checkpoint Science). "Trans-Atlantic Publications, Inc.", 2005.
MLA-čujuhus (9. p.)Peter Riley. Checkpoint Biology Pupil's Book (Checkpoint Science). "Trans-Atlantic Publications, Inc.", 2005.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.