Bradshaw, M. J., & Abbott, A. J. (1978). Earth's changing surface. Hodder and stoughton.
Chicago Edition CitationBradshaw, Michael J., i A. J. Abbott. Earth's Changing Surface. London: Hodder and stoughton, 1978.
Cita MLABradshaw, Michael J., i A. J. Abbott. Earth's Changing Surface. Hodder and stoughton, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.