Hubbard, E. D. (1910). Under marching orders: A story of Mary Porter Gamewell. Young People's Missionary Movement of the United States and Canada.
Chicago-referens (17:e uppl.)Hubbard, Ethel Daniels. Under Marching Orders: A Story of Mary Porter Gamewell. New York: Young People's Missionary Movement of the United States and Canada, 1910.
MLA-referens (9:e uppl.)Hubbard, Ethel Daniels. Under Marching Orders: A Story of Mary Porter Gamewell. Young People's Missionary Movement of the United States and Canada, 1910.
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