1. ASTM Designation D-664-80, Annual Book of ASTM Standards, Vol. 40, pp. 178-183.
2. IP Designation 177/64, IP Standards for Petroleum and its Products, Part I, Vol. 1, pp. 177.1-177.10.
3. IP Designation 213/82, IP Standards for Petroleum and its Products, Part I, Vol. 1, pp. 213.1-213.2.