Não informado. (1927). Heating and ventilating engineer and journal of air conditionin. Technitrade Journals.
Citação do estilo Chicago (17ª ed.)Não informado. Heating and Ventilating Engineer and Journal of Air Conditionin. London: Technitrade Journals, 1927.
Citação MLA (8ª ed.)Não informado. Heating and Ventilating Engineer and Journal of Air Conditionin. Technitrade Journals, 1927.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.