Okun, M. A. (1982). Programs for older adults. Jossey-Bass Inc..
Chicago-čujuhus (17. p.)Okun, Morris A. Programs for Older Adults. San Francisco: Jossey-Bass Inc., 1982.
MLA-čujuhus (9. p.)Okun, Morris A. Programs for Older Adults. Jossey-Bass Inc., 1982.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.