(1970). Perspective on our time: Issues and essays. Houghton Mifflin.
Chicago-čujuhus (17. p.)Perspective on Our Time: Issues and Essays. Boston: Houghton Mifflin, 1970.
MLA-čujuhus (9. p.)Perspective on Our Time: Issues and Essays. Houghton Mifflin, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.