Cita APA (7th ed.)

Herman, S. L., & Loper, O. E. (2012). Direct current fundamentals (8th ed.). Delmar Cengage Learning.

Cita Chicago (17th ed.)

Herman, Stephen L., i Orla E. Loper. Direct Current Fundamentals. 8th ed. Clifton Park, N.Y: Delmar Cengage Learning, 2012.

Cita MLA (9th ed.)

Herman, Stephen L., i Orla E. Loper. Direct Current Fundamentals. 8th ed. Delmar Cengage Learning, 2012.