Gates, A. I., & Peardon, M. C. (1944). Manual of directions, books III, IV, V and VI, types A, B, C, and D. Teachers College, Columbia University.
Citazione stile Chigago Style (17a edizione)Gates, Arthur Irving, e Mrs. Celeste Peardon. Manual of Directions, Books III, IV, V and VI, Types A, B, C, and D. New York City: Teachers College, Columbia University, 1944.
Citatione MLA (9a ed.)Gates, Arthur Irving, e Mrs. Celeste Peardon. Manual of Directions, Books III, IV, V and VI, Types A, B, C, and D. Teachers College, Columbia University, 1944.
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