Roth, Walter E. (1897). The expression of ideas by manual signs: a sign-language. (p. 273–301) Reprinted from Roth, W.E. Ethnological studies among the North-West-Central Queensland Aborigines. London, Queensland Agent-Generals Information Office, 1897; 71–90; Information collected from the following tribes; Pitta-Pitta, Boinji, Ulaolinya, Wonkajera, Walookera [= Warluwarra], Undekerebina, Kalkadoon, Mitakoodi, Woonamurra, Goa. Reprinted (1978) in Aboriginal sign languages of the Americas and Australia. New York: Plenum Press, vol. 2.