Memorundum: Evaluation of Alternative Programs for Bombing North Vietnam. Central Intelligence Agency, 1 June 1967. PDFLưu trữ 2016-03-04 tại Wayback Machine
Memorundum: Evaluation of Alternative Programs for Bombing North Vietnam. Central Intelligence Agency, 1 June 1967. PDFLưu trữ 2016-03-04 tại Wayback Machine