Hill, G. E. (1965). Management and improvement of guidance. Appleton Century Crofts.
Chicago-čujuhus (17. p.)Hill, George E. Management and Improvement of Guidance. Appleton Century Crofts, 1965.
MLA-čujuhus (9. p.)Hill, George E. Management and Improvement of Guidance. Appleton Century Crofts, 1965.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.