De Garis, B. K. (1979). European impact on the west Australian environment, 1829-1979. University of Western Australia : distributed by University of Western Australian Press.

De Garis, B. K. European Impact on the West Australian Environment, 1829-1979. Nedlands, W.A.: University of Western Australia : distributed by University of Western Australian Press, 1979.

De Garis, B. K. European Impact on the West Australian Environment, 1829-1979. University of Western Australia : distributed by University of Western Australian Press, 1979.