APA
(1931). Indian South East Coast: Palk Strait and Gulf of Mannar (Nothern Sheet). London: .
Chicago
1931. Indian South East Coast: Palk Strait and Gulf of Mannar (Nothern Sheet). London: .
Harvard
(1931). Indian South East Coast: Palk Strait and Gulf of Mannar (Nothern Sheet). London: .
MLA
Indian South East Coast: Palk Strait and Gulf of Mannar (Nothern Sheet). London: . 1931.