Charles Barrett also served in the AIF during the Great War. He embarked from Melbourne in May 1917 as a member of a contingent of reinforcements for the Camel Field Ambulance Unit, and served in Egypt and Palestine. His 1942 book, "On the Wallaby. Quest and adventure in many lands" contains an account and photographs of this mission.
As well as many articles, he wrote or contributed to numerous popular books on natural history, as well as his own travels and experiences. Some of these are:
Barrett, Charles. (1907). From Range to Sea. A bird lover's ways. T.C. Lothian: Melbourne.
Barrett, Charles (1913) The Bush Ramblers. T. Shaw Fitchett, Melbourne.
Barrett, Charles (1915) The Isle of Palms. Lothian, Melbourne.
Barrett, Charles. (1919). In Australian Wilds. The gleanings of a naturalist. Melbourne Publishing Co: Melbourne.
Barrett, Charles (1922) Egyptian Hours. Whitehead Morris, Alexandria.
Robin, Libby. (2001). The Flight of the Emu: a hundred years of Australian ornithology 1901-2001. Carlton, Vic. Melbourne University Press. ISBN0-522-84987-3