APA

Bullis E., . (1948). Human relations in the classroom. Delaware: Hambleton Company, Inc.

Chicago

Bullis Edmond, . 1948. Human relations in the classroom. Delaware: Hambleton Company, Inc.

Harvard

Bullis E., . (1948). Human relations in the classroom. Delaware: Hambleton Company, Inc.

MLA

Bullis Edmond, . Human relations in the classroom. Delaware: Hambleton Company, Inc. 1948.