| List (I) Author | List II (Definition of Ref Service) | ||
| A | American Library Association’s Glossary of Library Terms | 1 | direct personal aid within the library to persons in search of information |
| B | Margaret Hutchins | 2 | The reference service, defined by function can be divided into two categories: direct and indirect. |
| C | Ranganathan | 3 | Personal service to each reader |
| D | William Katz | 4 | that phase of library work which is directly concerned with assistance to readers seeking information and in using the resources of the library in study and research |
1
A-3, B-1, C-4, D-2
2
A-2, B-1, C-3, D-4
3
A-4, B-3, C-1, D-2
4
A-4, B-1, C-3, D-2