National League for Nursing. Research and Studies Service, National League for Nursing. Division of Research, National League for Nursing. Division of Public Policy and Research, & National League for Nursing. Research and Development. (1967). State-approved schools of nursing, L.P.N./L.V.N. National League for Nursing, Research and Studies Service.
芝加哥风格引文National League for Nursing. Research and Studies Service, National League for Nursing. Division of Research, National League for Nursing. Division of Public Policy and Research, 与 National League for Nursing. Research and Development. State-approved Schools of Nursing, L.P.N./L.V.N. New York, N.Y.: National League for Nursing, Research and Studies Service, 1967.
MLA引文National League for Nursing. Research and Studies Service, et al. State-approved Schools of Nursing, L.P.N./L.V.N. National League for Nursing, Research and Studies Service, 1967.