Цитирование APA (7-е изд.)
Khalid, A. Water supply in republic of Yemen. Modern state and directions of perfection.
Цитирование в стиле Чикаго (17-е изд.)Khalid, Abdo. Water Supply in Republic of Yemen. Modern State and Directions of Perfection.
Цитирование MLA (8-е изд.)Khalid, Abdo. Water Supply in Republic of Yemen. Modern State and Directions of Perfection.
警告：這些引文格式不一定是100％准確.