Cita APA (7th ed.)

Huggett, A. J., & Clifford, J. M. (1950). Professional problems of teaching. s. n.

Cita Chicago (17th ed.)

Huggett, Albert John, i John M. Clifford. Professional Problems of Teaching. [Lansingn Mich: s. n, 1950.

Cita MLA (9th ed.)

Huggett, Albert John, i John M. Clifford. Professional Problems of Teaching. s. n, 1950.