National Library (Singapore). Young People's Service. (1993). Window to the sky. Young People's Service, National Library, Singapore, Macmillan/McGraw-Hill.
Citace podle Chicago (17th ed.)National Library (Singapore). Young People's Service. Window to the Sky. Singapore : New York: Young People's Service, National Library, Singapore, Macmillan/McGraw-Hill, 1993.
Citace podle MLA (8th ed.)National Library (Singapore). Young People's Service. Window to the Sky. Young People's Service, National Library, Singapore, Macmillan/McGraw-Hill, 1993.
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