Library Association. Research and Development Committee, Library Association. Membership Committee, & Mallaber, K. A. (1974). Professional and non-professional duties in libraries: A descriptive list (2nd ed.). Library Association.

Library Association. Research and Development Committee, Library Association. Membership Committee, and Kenneth Aldridge Mallaber. Professional and Non-professional Duties in Libraries: A Descriptive List. 2nd ed. London: Library Association, 1974.

Library Association. Research and Development Committee, et al. Professional and Non-professional Duties in Libraries: A Descriptive List. 2nd ed. Library Association, 1974.