APA (7th ed.) Citation

National Electric Light Association. (1917). Commercial engineering course ... (2d ed. rev.). [publisher not identified].

Chicago Style (17th ed.) Citation

National Electric Light Association. Commercial Engineering Course ... 2d ed. rev. Chicago: [publisher not identified], 1917.

MLA (9th ed.) Citation

National Electric Light Association. Commercial Engineering Course ... 2d ed. rev. [publisher not identified], 1917.