RENNER, J. W., Stafford, D. G., & COULTER, V. J. (1977). Variation: Learning science. MacMillan.
Chicago-čujuhus (17. p.)RENNER, John W., Don G. Stafford, juo Vivian Jensen COULTER. Variation: Learning Science. New York: MacMillan, 1977.
MLA-čujuhus (9. p.)RENNER, John W., et al. Variation: Learning Science. MacMillan, 1977.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.