Bytheway, A., & Edwards, C. (1991). Essence of infromation systems. Prentice-Hall of India Private Limited.
استشهاد بنمط شيكاغوBytheway, Andy, و Chris Edwards. Essence of Infromation Systems. New Delhi: Prentice-Hall of India Private Limited, 1991.
MLA استشهادBytheway, Andy, و Chris Edwards. Essence of Infromation Systems. Prentice-Hall of India Private Limited, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.