Frommer, H. (2017). USA interstate: USA (West), USA (East), Puerto Rico, Hawaii, Alaska : updated, durable, water-repellent, write-on/wipe-off surface (13th edition.). Borch GmbH.
Chicago-Zitierstil (17. Ausg.)Frommer, H. USA Interstate: USA (West), USA (East), Puerto Rico, Hawaii, Alaska : Updated, Durable, Water-repellent, Write-on/wipe-off Surface. 13th edition. [Hauzenberg]: Borch GmbH, 2017.
MLA-Zitierstil (9. Ausg.)Frommer, H. USA Interstate: USA (West), USA (East), Puerto Rico, Hawaii, Alaska : Updated, Durable, Water-repellent, Write-on/wipe-off Surface. 13th edition. Borch GmbH, 2017.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.