Stephens, G. C., & Best North, B. (1974). Biology. John Wiley and Sons.
Chicago-čujuhus (17. p.)Stephens, Grover C., juo Barbara Best North. Biology. NewYork: John Wiley and Sons, 1974.
MLA-čujuhus (9. p.)Stephens, Grover C., juo Barbara Best North. Biology. John Wiley and Sons, 1974.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.