The first item is the primary reference for this program.
The second item is an example of the equivalent data given as tables.
Fessler, Theodore E.:
FLUID: A Numerical Interpolation Procedure for
Obtaining Thermodynamic and Transport Properties of Fluids.
NASA Technical Memorandum X-3572. August 1977.
Hilsenrath, Joseph; et al.:
Tables of Thermal Properties of Gases Comprising
Tables of Thermodynamic and Transport Properties of Air, Argon, Carbon Dioxide,
Carbon Monoxide, Hydrogen, Nitrogen, Oxygen, and Steam.
Circular 564, National Bureau of Standards, 1955.
Hendricks, Robert C. ; Baron, Anne K.; and Peller, Ildiko, C.:
GASP - A Computer Code for Calculating the Thermodynamic and Transport
Properties for Ten Fluids:
Parahydrogen, Helium, Neon, Methane, Nitrogen, Carbon Monoxide, Oxygen,
Fluorine, Argon, and Carbon Dioxide, February 1975.
Hendricks, Robert C. ; Peller, Ildiko C. ; and Baron, Anne K.:
WASP - A Flexible FORTRAN IV Computer Code for Calculating Water and Steam Properties.
, November 1973.
Rowlinson, J. S.: The Properties of Real Gases. Handbuch der Physik.
S. Flugge, ed., Vol. 12, Springer (Berlin), 1958, pp. 1-72.
Fessler, Theodore E.; and Ford, William F.:
User's Guide for SFTRAN/360, October 1977.