website introduction：Presents general information on whips, their history and the explanation of what makes the cracking sound.(including photos). Also gives some useful hints and tips for whip collectors.
website introduction：Picture and information about bullwhips and sonic booms, presented by Nova Online.
website introduction：Fanzine discusses the whips used in the television show, but focuses more on how to choose a whip, crack a whip, and tend to a whip. Offers related links.
website introduction：Information on how to join with books about leather and tips on how to make your own whips.
website introduction：Features a description of whip history, types, construction and a reference publication.