Nilsson, N. A., & Sheldrake, P. (1977). Enquiry into post-secondary enquiries (Rev ed.). Educational Research and Resources Unit, Flinders University of S.A..

Nilsson, Neil Alfred, and Peter Sheldrake. Enquiry into Post-secondary Enquiries. Rev ed. [Bedford Park, S.A.]: Educational Research and Resources Unit, Flinders University of S.A., 1977.

Nilsson, Neil Alfred, and Peter Sheldrake. Enquiry into Post-secondary Enquiries. Rev ed. Educational Research and Resources Unit, Flinders University of S.A., 1977.