APA

Gregory J. W., ill, .The rift valleys and geology of East AFrica; an account of the origin and history of the rift valleys of East Africa and their relation to the contemporary earth-movements which transformed the geography of the world. With some account of the prehistoric stone implements, soils, water supply, and mineral resources of the kenya colony. London: .

Chicago

Gregory John Walter, ill, .The rift valleys and geology of East AFrica; an account of the origin and history of the rift valleys of East Africa and their relation to the contemporary earth-movements which transformed the geography of the world. With some account of the prehistoric stone implements, soils, water supply, and mineral resources of the kenya colony. London: .

Harvard

Gregory J. W., ill, .The rift valleys and geology of East AFrica; an account of the origin and history of the rift valleys of East Africa and their relation to the contemporary earth-movements which transformed the geography of the world. With some account of the prehistoric stone implements, soils, water supply, and mineral resources of the kenya colony. London: .

MLA

Gregory John Walter, ill, .London: . .