Richardson, E. C. (1930). Classification, theoretical and practical (3rd ed.). Shoe String Press.
Cita Chicago Style (17a ed.)Richardson, Ernest Cushing. Classification, Theoretical and Practical. 3rd ed. Hamden, Conn: Shoe String Press, 1930.
Cita MLA (9a ed.)Richardson, Ernest Cushing. Classification, Theoretical and Practical. 3rd ed. Shoe String Press, 1930.
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