Cita APA (7th ed.)

Hop, F. U. (1989). The energy-saving house design handbook: Your super guide to earth sheltering, solar heating, and thermal construction. Prentice Hall.

Cita Chicago (17th ed.)

Hop, Frederick Uhlen. The Energy-saving House Design Handbook: Your Super Guide to Earth Sheltering, Solar Heating, and Thermal Construction. Englewood Cliffs, N.J: Prentice Hall, 1989.

Cita MLA (9th ed.)

Hop, Frederick Uhlen. The Energy-saving House Design Handbook: Your Super Guide to Earth Sheltering, Solar Heating, and Thermal Construction. Prentice Hall, 1989.