Ron Pickering. (2014). Complete Biology for Cambridge IGCSERG with CD-ROM (Second Edition) (2.). Oxford University Press.
Chicago-čujuhus (17. p.)Ron Pickering. Complete Biology for Cambridge IGCSERG with CD-ROM (Second Edition). 2. Oxford University Press, 2014.
MLA-čujuhus (9. p.)Ron Pickering. Complete Biology for Cambridge IGCSERG with CD-ROM (Second Edition). 2. Oxford University Press, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.