Kirkwood, L. H. (1961). Charging systems. Graduate School of Library Service, Rutgers - The State University.
Chicago-Zitierstil (17. Ausg.)Kirkwood, Leila H. Charging Systems. New Brunswick, N.J: Graduate School of Library Service, Rutgers - The State University, 1961.
MLA-Zitierstil (9. Ausg.)Kirkwood, Leila H. Charging Systems. Graduate School of Library Service, Rutgers - The State University, 1961.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.