Karstein, H. (1986). Positive thinking for positive living. Author.
Chicago-čujuhus (17. p.)Karstein, H. Positive Thinking for Positive Living. Bombay: Author, 1986.
MLA-čujuhus (9. p.)Karstein, H. Positive Thinking for Positive Living. Author, 1986.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.