APA (7th ed.) Citation

Hasan, M. S. (1992). A new digital overcurrent relay. [publisher not identified].

Chicago Style (17th ed.) Citation

Hasan, Md. Sayeed. A New Digital Overcurrent Relay. [Place of publication not identified]: [publisher not identified], 1992.

MLA (9th ed.) Citation

Hasan, Md. Sayeed. A New Digital Overcurrent Relay. [publisher not identified], 1992.