Dyfyniad APA

Lewis, W. (1969). Principles of Economic Planning (3rd Ed.). George Allen & Unwin.

Dyfyniad Arddull Chicago

Lewis, W.Arthur. Principles of Economic Planning. 3rd Ed. Bombay: George Allen & Unwin, 1969.

Dyfyniad MLA

Lewis, W.Arthur. Principles of Economic Planning. 3rd Ed. George Allen & Unwin, 1969.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.