Cita APA (7th ed.)

Royal, H. F. (1976). The gentle art of interviewing and interrogation: A professional manual and guide. Prentice-Hall.

Cita Chicago (17th ed.)

Royal, Herbert F. The Gentle Art of Interviewing and Interrogation: A Professional Manual and Guide. Englewood Cliffs, N. J: Prentice-Hall, 1976.

Cita MLA (9th ed.)

Royal, Herbert F. The Gentle Art of Interviewing and Interrogation: A Professional Manual and Guide. Prentice-Hall, 1976.