Wickersham, J. P. Methods of instrustion. Lippincott.
Chicago-čujuhus (17. p.)Wickersham, James Pyle. Methods of Instrustion. Philadelphia: Lippincott.
MLA-čujuhus (9. p.)Wickersham, James Pyle. Methods of Instrustion. Lippincott.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.