Peter Riley. (2005). Checkpoint Biology Pupil's Book (Checkpoint Science). "Trans-Atlantic Publications, Inc.".
Chicago-viite (17. p.)Peter Riley. Checkpoint Biology Pupil's Book (Checkpoint Science). "Trans-Atlantic Publications, Inc.", 2005.
MLA-viite (9. p.)Peter Riley. Checkpoint Biology Pupil's Book (Checkpoint Science). "Trans-Atlantic Publications, Inc.", 2005.
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