данных>, <. (1991). Publishers' international ISBN directory. 18 ed. 1991/92: 18 ed. of Publishers' international directory with ISBN index and the 12. ed. of the International ISBN publishers' directory. 2: Numerical ISBN section. München: Saur.
Chicago-стиль цитированияданных>, <нет. Publishers' International ISBN Directory. 18 Ed. 1991/92: 18 Ed. of Publishers' International Directory With ISBN Index and the 12. Ed. of the International ISBN Publishers' Directory. 2: Numerical ISBN Section. München: Saur, 1991.
MLA-цитированиеданных>, <нет. Publishers' International ISBN Directory. 18 Ed. 1991/92: 18 Ed. of Publishers' International Directory With ISBN Index and the 12. Ed. of the International ISBN Publishers' Directory. 2: Numerical ISBN Section. München: Saur, 1991.