APA (7. basım) Alıntı

Scheppach, R. C. (1972). State projections of the gross national product 1970, 1980.

Chicago Style (17. basım) Atıf

Scheppach, Raymound C. State Projections of the Gross National Product 1970, 1980. Lexington, Mass., D.C. heath and Co, 1972.

MLA (9th ed.) Atıf

Scheppach, Raymound C. State Projections of the Gross National Product 1970, 1980. 1972.