Levy , C. K. (1978). Elements of biology (2nd ed.). Addison-Wesley.
Chicago-čujuhus (17. p.)Levy , Charles K. Elements of Biology. 2nd ed. Reading, Mass: Addison-Wesley, 1978.
MLA-čujuhus (9. p.)Levy , Charles K. Elements of Biology. 2nd ed. Addison-Wesley, 1978.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.