Nelson Associates, Inc, New York State Library. Division of Library Development, & Ellis, R. A. (1970). NIL: a study of unfilled interlibrary loan requests in the NYSILL system: A report prepared for the Division of Library Development of the New York State Library.
Цитирование в стиле Чикаго (17-е изд.)Nelson Associates, Inc, New York State Library. Division of Library Development, и Richard Alan Ellis. NIL: A Study of Unfilled Interlibrary Loan Requests in the NYSILL System: A Report Prepared for the Division of Library Development of the New York State Library. Washington, 1970.
Цитирование MLA (8-е изд.)Nelson Associates, Inc, et al. NIL: A Study of Unfilled Interlibrary Loan Requests in the NYSILL System: A Report Prepared for the Division of Library Development of the New York State Library. 1970.