Tham khảo Sông Helmand

Various authors. “HELMAND RIVER”. Encyclopædia Iranica. United States: Columbia University.
Frye, Richard N. (1963). The Heritage of Persia. World Publishing company, Cleveland, Ohio. Mentor Book edition, 1966.
Toynbee, Arnold J. (1961). Between Oxus and Jumna. London. Oxford University Press.
Vogelsang, W. (1985). "Early historical Arachosia in South-east Afghanistan; Meeting-place between East and West." Iranica antiqua, 20 (1985), pp. 55–99.

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