Cita APA (7th ed.)
Singh, G., & Singh, J. (1991). Highway engineering (rev. & enlarged ed.). Standard publishers distributors.
Cita Chicago (17th ed.)
Singh, Gurcharan, i Jagdish Singh. Highway Engineering. rev. & enlarged ed. Delhi: Standard publishers distributors, 1991.
Cita MLA (9th ed.)
Singh, Gurcharan, i Jagdish Singh. Highway Engineering. rev. & enlarged ed. Standard publishers distributors, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.