Παραπομπή APA

Khalil, H. A. E. E., & Khalil, E. E. Energy efficiency in the urban environment.

Παραπομπή Chicago Style

Khalil, Heba Allah Essam E., και E. E. Khalil. Energy Efficiency in the Urban Environment.

Παραπομπή MLA

Khalil, Heba Allah Essam E., και E. E. Khalil. Energy Efficiency in the Urban Environment.