Collis, J. S. (1954). The triumph of the tree. The Viking Press.
Lua i Stíl Chicago (17ú heag.)Collis, John Stewart. The Triumph of the Tree. Nueva York: The Viking Press, 1954.
Lua MLA (9ú heag.)Collis, John Stewart. The Triumph of the Tree. The Viking Press, 1954.
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