Article 1: Hotel Security: The Evolving Electronic Lock, Special Report, By Elizabeth Lauer, Hotel-Onine, Spring 1999

Article 2: Swiping the Cards in a Key Card Lock, by typesoflocks.com

Article 3: DIY-Installing Keyless Doorlock in Your Home

Article 4: Designing a Simple Card Reader Circuit (For technicians or students)

Article 5: A Simple Cardlock That Reads a Punched Hole Card. (For technicians or students)

Article 6: Family Security in Hotels and Motels

Article 7: Hotel Security as a Guest Amenity