Raven, P. H., & Johnson, G. B. (1988). Understanding Biology (2nd.). Wm. C. Brown Publishers.
Chicago-čujuhus (17. p.)Raven, Peter H., juo George B. Johnson. Understanding Biology. 2nd. London: Wm. C. Brown Publishers, 1988.
MLA-čujuhus (9. p.)Raven, Peter H., juo George B. Johnson. Understanding Biology. 2nd. Wm. C. Brown Publishers, 1988.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.