Knapp, S. D., & Gavryck, J. A. (1978). Computer Based Reference Service--A Course Taught by Practitioners.
Citazione stile Chigago Style (17a edizione)Knapp, Sara D., e Jacquelyn A. Gavryck. Computer Based Reference Service--A Course Taught by Practitioners. 1978.
Citatione MLA (9a ed.)Knapp, Sara D., e Jacquelyn A. Gavryck. Computer Based Reference Service--A Course Taught by Practitioners. 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.