Lessons In Electric Circuits -- Volume IV (Digital) - Chapter 11
Bidirectional Counter - Up Down Binary Counter
3 Bit Counter JK Flip flop | Tinkercad
How to get J/K counter to count from 2 - 9? - Electrical Engineering Stack Exchange
CS201 Sequential Design Lab
flipflop - Why use JK Flip Flops in syncronous/asyncronous binary counters rather than D flip flops? - Electrical Engineering Stack Exchange
Counter Circuits
4 bit synchronous up counter using JK flip flops | Tinkercad
Asynchronous Counter - ElectronicsHub
Verilog | JK Flip Flop - javatpoint
Ring Counter in Digital Logic - GeeksforGeeks
How to design a synchronous counter 4 bit using JK flip flop that can count up even numbers from 0 to 14, and count down odd numbers from 15 to 0 in 1 system - Quora
Flip-flop (electronics) - Wikipedia
D-Type Flip Flop Circuit Diagrams in Proteus - The Engineering Projects
Toggle Flip-flop - The T-type Flip-flop
PRESET and CLEAR inputs in Flip-Flop | Asynchronous inputs in Flip-Flop - YouTube