International ISBN Agency. (2000). Publishers' International ISBN Directory: 27th edition of Publishers' International Directory with ISBN Index and the 21st edition of the International ISBN Publishers' Directory (27th ed.). K. G. Saur, International ISBN Agency, R. R. Bowker.
Παραπομπή σε μορφή Chicago (17η εκδ.)International ISBN Agency. Publishers' International ISBN Directory: 27th Edition of Publishers' International Directory with ISBN Index and the 21st Edition of the International ISBN Publishers' Directory. 27th ed. Munchen : Berlin : New Providence, London: K. G. Saur, International ISBN Agency, R. R. Bowker, 2000.
Παραπομπή σε μορφή MLA (9th εκδ.)International ISBN Agency. Publishers' International ISBN Directory: 27th Edition of Publishers' International Directory with ISBN Index and the 21st Edition of the International ISBN Publishers' Directory. 27th ed. K. G. Saur, International ISBN Agency, R. R. Bowker, 2000.