@book{130120,
	author = {Zabri Zakaria, },
	title = {Khalifah Islam yang terkemuka},
	publisher = {Pustaka Aspirasi Cemerlang , },
	year = {2015},
	series = {Tamadun Islam yang gemilang},
	address = {Petaling Jaya, Selangor : },
	note = {Includes questions and exercises}
}