Volpe & E. Peter. (1993). Biology and Human Concerns (4th ed.). Wm. C. Brown Publishers.
Chicago-čujuhus (17. p.)Volpe juo E. Peter. Biology and Human Concerns. 4th ed. Dubuque, IA: Wm. C. Brown Publishers, 1993.
MLA-čujuhus (9. p.)Volpe juo E. Peter. Biology and Human Concerns. 4th ed. Wm. C. Brown Publishers, 1993.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.