1. Witanowski, M.; Stefaniak, L.; Webb, G.A. Annu. Rep. NMR Spectrosc. 1981, 11B, 1–502; 1986, 18, 1–761.
2. Martin, G. J.; Martin, M. L.; Gouesnard, J.-P. l5N-NMR Spectroscopy, NMR Basic Princ. Prog. 1981, 18, 1–382.
3. Levy, G.C.; Lichter, R.L. Nitrogen-15 NMR Spectroscopy; Wiley-Interscience: New York, 1979, 1–221.
4. Witanowski, M.; Stefaniak, L.; Webb, G.A. Annu. Rep. NMR Spectrosc. 1977, 7, 117–244.
5. Witanowski, M.; Webb, G.A., Eds.; Nitrogen NMR; Plenum: London, 1973.