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. ASTM Designation D-974-80, 1981 Annual Book of ASTM Standards, Vol. 40, pp. 332-338.
4. IP Designation 139/65, IP Standards for Petroleum and its Products, Part I, pp. 139.1-139.10.