(1997). The Frankfurt CD-ROM. The electronic guide to the Frankfurt book fair.
Chicago Style (17. basım) AtıfThe Frankfurt CD-ROM. The Electronic Guide to the Frankfurt Book Fair. 1997.
MLA (9th ed.) AtıfThe Frankfurt CD-ROM. The Electronic Guide to the Frankfurt Book Fair. 1997.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..