Christopherson, R. W., & Hobbs, G. L. (1998). Applied physical geography: Geosystems in the laboratory (2nd ed.). Prentice-Hall of India.
استشهاد بنمط شيكاغوChristopherson, Robert W., و Gail Lewis Hobbs. Applied Physical Geography: Geosystems in the Laboratory. 2nd ed. London: Prentice-Hall of India, 1998.
MLA استشهادChristopherson, Robert W., و Gail Lewis Hobbs. Applied Physical Geography: Geosystems in the Laboratory. 2nd ed. Prentice-Hall of India, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.