KuneKunes almost went extinct in the 1970s, with around only 50 KuneKunes left in New Zealand. They now number in the thousands and came over to America in 1995. There are many articles and information out there about KuneKune history and their care. Here is a list of sites with extensive information on them.
American KuneKune Pig Society (AKKPS): https://americankunekunepigsociety.org/education/
Empire KuneKune Pig Association (EKPA): https://www.ekpa.org/resources
British KuneKune Pig Society: https://www.britishkunekunesociety.org.uk/
New Zealand KuneKune Association: https://kunekune.co.nz/
Red Roof KuneKunes: https://redroofkunekunes.com/information-about-kunekune-pigs/
Small-scale Outdoor Pig Breeding by Wendy Scudamore
Storey's Guide to Raising Pigs by Kelly Klober