Παραπομπή APA

Lewis, J. P. (1969). Introduction to mathematics: For students of economics/2e (2nd ed.). Macmillan & Co.

Παραπομπή Chicago Style

Lewis, J. Parry. Introduction to Mathematics: For Students of Economics/2e. 2nd ed. London: Macmillan & Co, 1969.

Παραπομπή MLA

Lewis, J. Parry. Introduction to Mathematics: For Students of Economics/2e. 2nd ed. Macmillan & Co, 1969.