Dyfyniad APA

Douglass, H. R., & Boardman, C. W. (1934). Supervision in secondary schools. Houghton Mifflin company.

Dyfyniad Arddull Chicago

Douglass, Harl Roy, and Charles Willis Boardman. Supervision in Secondary Schools. Boston, New York [etc.]: Houghton Mifflin company, 1934.

Dyfyniad MLA

Douglass, Harl Roy, and Charles Willis Boardman. Supervision in Secondary Schools. Houghton Mifflin company, 1934.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.