Martin, D. (1991). Geographic information systems and their socioeconomic applications. Routledge.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Martin, David. Geographic Information Systems and Their Socioeconomic Applications. London ; New York: Routledge, 1991.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Martin, David. Geographic Information Systems and Their Socioeconomic Applications. Routledge, 1991.