Roe, J. (1992). The columbia river: A historical tranel guide. Colorado: Fulcrum Publishing.
Παραπομπή Chicago StyleRoe, Joann. The Columbia River: A Historical Tranel Guide. Colorado: Fulcrum Publishing, 1992.
MLA CitationRoe, Joann. The Columbia River: A Historical Tranel Guide. Colorado: Fulcrum Publishing, 1992.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.