American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.
Chicago-čujuhus (17. p.)American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.
MLA-čujuhus (9. p.)American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.