Roehr, D., & Lokman, K. (2015). Step Into The Abyss: The recently opened Glacier Skywalk in Jasper National Park, Alberta. Topos.
Citace podle Chicago (17th ed.)Roehr, Daniel, a Kees Lokman. "Step Into The Abyss: The Recently Opened Glacier Skywalk in Jasper National Park, Alberta." Topos 2015.
Citace podle MLA (8th ed.)Roehr, Daniel, a Kees Lokman. "Step Into The Abyss: The Recently Opened Glacier Skywalk in Jasper National Park, Alberta." Topos, 2015.
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