Bader. (1970). The Integration of The State Insurance Into The Economic System of The German Democratic Republic. The Institute of National Planning.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিBader. The Integration of The State Insurance Into The Economic System of The German Democratic Republic. Cairo: The Institute of National Planning, 1970.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিBader. The Integration of The State Insurance Into The Economic System of The German Democratic Republic. The Institute of National Planning, 1970.
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