YOUNG, A. (1974). Slope development. Macmillan Education.
Cita Chicago (17th ed.)YOUNG, Anthony. Slope Development. London: Macmillan Education, 1974.
Cita MLA (9th ed.)YOUNG, Anthony. Slope Development. Macmillan Education, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.