Jungraithmayr, Herrmann. 1966/67. Specimens of the Pa'a ("Afa") and Warja languages with notes on the tribes of Ningi Chiefdom (Bauchi Province, Northern Nigeria). Afrika und Übersee 50: 194- 205.
Skinner, Margaret G. 1974. The two fathers of seven children and the Kano man: An analysis of a Pa'a oral narrative. Africana Marburgensia 7(1): 51-74.
Skinner, Margaret G. 1977. Gender in Pa'a. In Newman, Paul and Newman, Roxana Ma (eds). Papers in Chadic Linguistics: Papers from the Leiden Colloquium on the Chadic Language Family. Leiden: Afrika-Studiecentrum. pp. 167-174.