Flip-Flops - Official TF2 Wiki | Official Team Fortress Wiki
Flip-flop (electronics) - Wikipedia
flipflop - The logic gate design of a positive edge triggered, master slave d flip flop with asynchronous inputs preset and clear? - Electrical Engineering Stack Exchange
Latches and Flip-Flops | mbedded.ninja
File:D flip flop from nand gates.svg - Wikimedia Commons