APA (7th ed.) Citation

Ridenour, F. (1967). So, What's the Difference? GL Regal Books, A Division of G/L Publicaitons.

Chicago Style (17th ed.) Citation

Ridenour, Fritz. So, What's the Difference? Glendale, CA: GL Regal Books, A Division of G/L Publicaitons, 1967.

MLA (9th ed.) Citation

Ridenour, Fritz. So, What's the Difference? GL Regal Books, A Division of G/L Publicaitons, 1967.