Waits, H. E. (1922). Practical problems of the school. Benj. H. Sanborn.
Chicago-čujuhus (17. p.)Waits, Harmon Ebert. Practical Problems of the School. Chicago: Benj. H. Sanborn, 1922.
MLA-čujuhus (9. p.)Waits, Harmon Ebert. Practical Problems of the School. Benj. H. Sanborn, 1922.
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