APA (7th ed.) Citation

Froeschels, E. (1948). Twentieth century speech and voice correction. Philosophical Library.

Chicago Style (17th ed.) Citation

Froeschels, Emil. Twentieth Century Speech and Voice Correction. Philosophical Library, 1948.

MLA (8th ed.) Citation

Froeschels, Emil. Twentieth Century Speech and Voice Correction. Philosophical Library, 1948.

Warning: These citations may not always be 100% accurate.