Jorgenson, Dale; Yun, Kun-Young (November 15, 2002). "Efficient Taxation of Income"(PDF). Harvard. Archived from the original(PDF) on February 21, 2007. Retrieved July 17, 2007.
Jorgenson, Dale; Yun, Kun-Young (November 15, 2002). "Efficient Taxation of Income"(PDF). Harvard. Archived from the original(PDF) on February 21, 2007. Retrieved July 17, 2007.