Knauthe, H. E. (1966). Prospective Planning and Investment Decisions: Economic Problems Concerned with Preparation and Carrying out of Investments. The institute of national planning.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Knauthe, Habil Erhart. Prospective Planning and Investment Decisions: Economic Problems Concerned with Preparation and Carrying Out of Investments. Cairo: The institute of national planning, 1966.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Knauthe, Habil Erhart. Prospective Planning and Investment Decisions: Economic Problems Concerned with Preparation and Carrying Out of Investments. The institute of national planning, 1966.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.