APA Citation

Davidson, M., & Davidson, M. (1946). An Easy outline of astronomy (2. edition --.). London, Sydney: Watts.

Chicago Style Citation

Davidson, Martin, and Martin Davidson. An Easy Outline of Astronomy. 2. edition --. London, Sydney: Watts, 1946.

MLA Citation

Davidson, Martin, and Martin Davidson. An Easy Outline of Astronomy. 2. edition --. London, Sydney: Watts, 1946.

Warning: These citations may not always be 100% accurate.