Updated Guide on How to Program an Attiny13a or 13 With the Arduino IDE : 8 Steps (with Pictures) - Instructables
Digital LED Thermometer with Microcontroller AVR ATtiny13 (Small Electronics Projects with Microcontrollers Book 1) (English Edition) eBook : Schramm, Michael: Amazon.de: Kindle-Shop
About attiny13a - Programming Questions - Arduino Forum