(1953). Improving teaching-learning processes.
Chicago-čujuhus (17. p.)Improving Teaching-learning Processes. 1953.
MLA-čujuhus (9. p.)Improving Teaching-learning Processes. 1953.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.