Nalepka, R. F., Colwell, J. E., Rice, D. P., & Stonesifer, G. R. (1977). Wheat productivity estimates using Landsat Data Type 2 Progress report, 16 August 1976- 15 November 1976. National Aeronautics and Space Administration, Goddard Space Flight Center.
Lua i Stíl Chicago (17ú heag.)Nalepka, Richard F., John E. Colwell, Daniel P. Rice, agus G. R. Stonesifer. Wheat Productivity Estimates Using Landsat Data Type 2 Progress Report, 16 August 1976- 15 November 1976. Greenbelt, Maryland: National Aeronautics and Space Administration, Goddard Space Flight Center, 1977.
Lua MLA (8ú heag.)Nalepka, Richard F., et al. Wheat Productivity Estimates Using Landsat Data Type 2 Progress Report, 16 August 1976- 15 November 1976. National Aeronautics and Space Administration, Goddard Space Flight Center, 1977.