Rules
A beginners guide to the rules of field hockey (2011)
https://www.worldhockey.org/vsite/vcontent/page/custom/0,8510,1181-116515-117782-13003-39980-custom-item,00.html
Indoor Hockey Rules 2011
https://www.fihockey.org/vsite/vfile/page/fileurl/0,11040,1181-203464-220687-168859-0-file,00.pdf
Field Hockey Rules 2011
https://www.fihockey.org/vsite/vfile/page/fileurl/0,11040,1181-203465-220688-168858-0-file,00.pdf