- www.wonkeedonkeetools.co.uk/sockets-and-socket-sets/what-are-the-different-types-of-socket/
- https://www.craftsman.com/products/hand-tools/...sockets/socket-accessories
- http://www.homedepot.com/b/Tools-Hardware-Hand-Tools-Ratchets-Sockets/N-5yc1vZc242
- www.harborfreight.com/hand-tools/sockets-ratchets.html
- www.sears.com/tools-ratchets-sockets-socket-accessories/b-1214364360
- https://www.grainger.com/category/socket-wrench-accessories/sockets-and-bits/hand-tools/ecatalog/N-nid
- www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&cad=rja&uact=8&ved=0ahUKEwjCtdXTvb3PAhWBGD4KHYNvDCMQFghGMAY&url=http%3A%2F%2Fwww.te.com%2Fusa-en%2Fplp%2Frelay-accessories-sockets-clips%2FY30D4.html&usg=AFQjCNECf4M-hb90_YoMVe-LcecaDRDq3g&sig2=vUndS_PmnnxIkFmJJLZ5Kg