APA

Dallas D., Pelham L., . (1990). Let's Learn English : 4. Cairo: The Egyptian International Publishing Company.

Chicago

Dallas Don, Pelham Linda, . 1990. Let's Learn English : 4. Cairo: The Egyptian International Publishing Company.

Harvard

Dallas D., Pelham L., . (1990). Let's Learn English : 4. Cairo: The Egyptian International Publishing Company.

MLA

Dallas Don, Pelham Linda, . Let's Learn English : 4. Cairo: The Egyptian International Publishing Company. 1990.