APA (7th ed.) Citation

Hardin, D. C. (1982). A new method for electronic piano tuning. Hardin Piano Service.

Chicago Style (17th ed.) Citation

Hardin, Donald C. A New Method for Electronic Piano Tuning. Stockton, Calif: Hardin Piano Service, 1982.

MLA (9th ed.) Citation

Hardin, Donald C. A New Method for Electronic Piano Tuning. Hardin Piano Service, 1982.