Source: http://www.chtf.stuba.sk/~szolcsanyi/education/files/Organicka%20chemia%20II/Prednaska%207_Derivaty%20karboxylovych%20kyselin_Vlastnosti,%20priprava%20a%20reakcie/Doplnkove%20studijne%20materialy/Amides,%20Lactams/Amidation%20Reactions%20from%20the%20Direct%20Coupling%20of%20Metal%20Carboxylate%20Salts%20with%20Amines.pdf