Viewtech Educational Media. (1999). Energy, nature's power source: Mechanical, thermal & light. Viewtech Educational Media.
Chicago Style (17th ed.) CitationViewtech Educational Media. Energy, Nature's Power Source: Mechanical, Thermal & Light. Bristol,UK: Viewtech Educational Media, 1999.
MLA (8th ed.) CitationViewtech Educational Media. Energy, Nature's Power Source: Mechanical, Thermal & Light. Viewtech Educational Media, 1999.
Warning: These citations may not always be 100% accurate.