Hartwell, F. P. (2021). American electricians' handbook (Seventeenth edition.). McGraw-Hill.
Cita Chicago (17th ed.)Hartwell, Frederic P. American Electricians' Handbook. Seventeenth edition. New York: McGraw-Hill, 2021.
Cita MLA (9th ed.)Hartwell, Frederic P. American Electricians' Handbook. Seventeenth edition. McGraw-Hill, 2021.
Atenció: Aquestes cites poden no estar 100% correctes.