Gaya APA

Hellemans, T, L, J., Vantrappen, G. (1984). Gastrointestinal Tract Disorders in The Elderly . New York: Churchill Livingstone Elsevier.

Gaya MLA

Hellemans, The, Late, J.., Vantrappen, G.. "Gastrointestinal Tract Disorders in The Elderly". New York: Churchill Livingstone Elsevier, 1984. Text.