Haskel, S., & Sygoda, D. (1977). Contemporary Biology. Amsco School Publications, Inc.
Chicago-čujuhus (17. p.)Haskel, Sebastian, juo David Sygoda. Contemporary Biology. New York, NY: Amsco School Publications, Inc, 1977.
MLA-čujuhus (9. p.)Haskel, Sebastian, juo David Sygoda. Contemporary Biology. Amsco School Publications, Inc, 1977.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.