Basic Tutorial Lesson 11: Building a Binary Counter Using JK Flip-Flops - Emagtech Wiki
Flip-flop (electronics) - Wikipedia
Lessons In Electric Circuits -- Volume IV (Digital) - Chapter 11
4 bit Asynchronous Counter with J K Flip Flop - YouSpice
Q. 6.27: Design a counter with the following repeated binary sequence: 0, 1, 2, 3, 4, 5, 6. Use JK - YouTube
Introduction to JK Flip Flop - The Engineering Projects
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
How to get J/K counter to count from 2 - 9? - Electrical Engineering Stack Exchange
verilog - How do I use flip flop output as input for reset signal - Stack Overflow
How to design a 4 bit even synchronous counter using flip flops - Quora