APA-čujuhus (7. p.)
Early, G. H. (1969). Perceptual training in the curriculum. C. E. Merrill Pub. Co..
Chicago-čujuhus (17. p.)
Early, George H. Perceptual Training in the Curriculum. Columbus, Ohio: C. E. Merrill Pub. Co., 1969.
MLA-čujuhus (9. p.)
Early, George H. Perceptual Training in the Curriculum. C. E. Merrill Pub. Co., 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.