APA (7th ed.) Citation

Ahmed, H. N. S., & unknown. (1991). Thermal insulation economics for Saudi residential buildings.

Chicago Style (17th ed.) Citation

Ahmed, Hadeel Noman Saied, and unknown. Thermal Insulation Economics for Saudi Residential Buildings. 1991.

MLA (9th ed.) Citation

Ahmed, Hadeel Noman Saied, and unknown. Thermal Insulation Economics for Saudi Residential Buildings. 1991.

Warning: These citations may not always be 100% accurate.