Παραπομπή APA

Duggal, A. K., & Puri, P. V. (1991). Laboratory Manual in Highway Engineering. Wiley Eastern.

Παραπομπή Chicago Style

Duggal, Ajay K., και P. Vijay Puri. Laboratory Manual in Highway Engineering. New Delhi: Wiley Eastern, 1991.

Παραπομπή MLA

Duggal, Ajay K., και P. Vijay Puri. Laboratory Manual in Highway Engineering. Wiley Eastern, 1991.