Gaya APA

Gratz, N, G., Knudsen, A, B. (1995). The Rise and Spread of Dengue, Dengue Haemorrhagic Fever and Its Vectors . english: World Health Organization.

Gaya MLA

Gratz, Norman, G.., Knudsen, A., Bruce. "The Rise and Spread of Dengue, Dengue Haemorrhagic Fever and Its Vectors". english: World Health Organization, 1995. Text.