Wortman, G. (2004). Sheep eaters - shelters and petroglyphs. Documentary Educational Resources.
Chicago-Zitierstil (17. Ausg.)Wortman, Gary. Sheep Eaters - Shelters and Petroglyphs. Watertown, Mass: Documentary Educational Resources, 2004.
MLA-Zitierstil (9. Ausg.)Wortman, Gary. Sheep Eaters - Shelters and Petroglyphs. Documentary Educational Resources, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.