API MPMS 9.2-2003 石油計量標準手冊第9章“密度測定第2節”壓力比重計輕質烴密度或相對密度的標準測試方法(第二版)
Manual of Petroleum Measurement Standards Chapter 9—Density Determination Section 2—Standard Test Method for Density or Relative Density of Light Hydrocarbons by Pressure Hydrometer (Second Edition)