International Energy Agency Heat Pump Conference & Bosma, J. (1993). Heat pumps for energy efficiency and environmental progress: Proceedings of the fourth international energy agency heat pump conference, Maastricht, the Netherlands, 26-29 April, 1993. Elsevier.
Chicago-viite (17. p.)International Energy Agency Heat Pump Conference ja J. Bosma. Heat Pumps for Energy Efficiency and Environmental Progress: Proceedings of the Fourth International Energy Agency Heat Pump Conference, Maastricht, the Netherlands, 26-29 April, 1993. Amsterdam: Elsevier, 1993.
MLA-viite (9. p.)International Energy Agency Heat Pump Conference ja J. Bosma. Heat Pumps for Energy Efficiency and Environmental Progress: Proceedings of the Fourth International Energy Agency Heat Pump Conference, Maastricht, the Netherlands, 26-29 April, 1993. Elsevier, 1993.