C. Scheppach Raymond. (1980). State Projections of the Gross National Product, 1970, 1980 (In lần thứ 1.). London: Lexington Books.
Παραπομπή Chicago StyleC. Scheppach Raymond. State Projections of the Gross National Product, 1970, 1980. In lần thứ 1. London: Lexington Books, 1980.
Παραπομπή MLAC. Scheppach Raymond. State Projections of the Gross National Product, 1970, 1980. In lần thứ 1. London: Lexington Books, 1980.
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