Freeman, L. R., & Harmon, B. (1925). Mother of rivers: An account of a photographic expedition to the great Columbia ice field of the Canadian Rockies. National Geographic Society.
Cita Chicago Style (17a ed.)Freeman, Lewis R., y Byron Harmon. Mother of Rivers: An Account of a Photographic Expedition to the Great Columbia Ice Field of the Canadian Rockies. [Washington, D.C.: National Geographic Society, 1925.
Cita MLA (8a ed.)Freeman, Lewis R., y Byron Harmon. Mother of Rivers: An Account of a Photographic Expedition to the Great Columbia Ice Field of the Canadian Rockies. National Geographic Society, 1925.
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