Cita APA (7th ed.)

Richardson, E. C. (1930). Classification, theoretical and practical (3rd ed.). Shoe String Press.

Cita Chicago (17th ed.)

Richardson, Ernest Cushing. Classification, Theoretical and Practical. 3rd ed. Hamden, Conn: Shoe String Press, 1930.

Cita MLA (9th ed.)

Richardson, Ernest Cushing. Classification, Theoretical and Practical. 3rd ed. Shoe String Press, 1930.