(1990). Diseases of the digestive system. World health organization.
Chicagoスタイル(17版)引用形式Diseases of the Digestive System. Ginebra: World health organization, 1990.
MLA(9版)引用形式Diseases of the Digestive System. World health organization, 1990.
警告: この引用は必ずしも正確ではありません.