Spencer, H. (1970). The principles of psychology. Gregg International Publishers Limited.
Chicago-čujuhus (17. p.)Spencer, Herbert. The Principles of Psychology. Farnham: Gregg International Publishers Limited, 1970.
MLA-čujuhus (9. p.)Spencer, Herbert. The Principles of Psychology. Gregg International Publishers Limited, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.