APA (7th ed.) Citation

Al-Abdul Wahab, H., & unknown. (1997). Development of performance-based bitumen specifications for the Gulf countries.

Chicago Style (17th ed.) Citation

Al-Abdul Wahab, H.I, and unknown. Development of Performance-based Bitumen Specifications for the Gulf Countries. 1997.

MLA (9th ed.) Citation

Al-Abdul Wahab, H.I, and unknown. Development of Performance-based Bitumen Specifications for the Gulf Countries. 1997.

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