George Fry & Associates. (1961). Circulation system selection manual for public libraries: An extract from: Study of circulation control systems ; public libraries, college and university libraries, special libraries. Library Technology Project of the American Library Association and the Council on Library Resources, INC.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)George Fry & Associates. Circulation System Selection Manual for Public Libraries: An Extract from: Study of Circulation Control Systems ; Public Libraries, College and University Libraries, Special Libraries. Chicago: Library Technology Project of the American Library Association and the Council on Library Resources, INC, 1961.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)George Fry & Associates. Circulation System Selection Manual for Public Libraries: An Extract from: Study of Circulation Control Systems ; Public Libraries, College and University Libraries, Special Libraries. Library Technology Project of the American Library Association and the Council on Library Resources, INC, 1961.