Helland, M. (1975). They knew our valley. Helland.
Cita Chicago Style (17a ed.)Helland, Maurice. They Knew Our Valley. Yakima, Wash.: Helland, 1975.
Cita MLA (8a ed.)Helland, Maurice. They Knew Our Valley. Helland, 1975.
Precaución: Estas citas no son 100% exactas.