APA (7th ed.) Citation

Harman, T. L., & Allen, C. E. (1993). Guide to the National Electrical Code (1993 ed.). PTR Prentice Hall.

Chicago Style (17th ed.) Citation

Harman, Thomas L., and Charles E. Allen. Guide to the National Electrical Code. 1993 ed. Englewood Cliffs, NJ: PTR Prentice Hall, 1993.

MLA (9th ed.) Citation

Harman, Thomas L., and Charles E. Allen. Guide to the National Electrical Code. 1993 ed. PTR Prentice Hall, 1993.