Não informado. (1969). Airline management and marketing including american aviation. Ziff-Davis Aviation Division.
Citação do estilo Chicago (17ª ed.)Não informado. Airline Management and Marketing Including American Aviation. Washington: Ziff-Davis Aviation Division, 1969.
Citação MLA (8ª ed.)Não informado. Airline Management and Marketing Including American Aviation. Ziff-Davis Aviation Division, 1969.
警告：这些引文格式不一定是100％准确.