Dallek, Robert. Nixon and Kissinger, Harper Collins, 2007.
In the Library: Call no. E856 .D35 2007
This is a terrific book. See especially P. 135-167, 285-324 on the internal dynamics of foreign policy, Vietnam and the opening to China.
Nixon and Brezhnev prove that even world leaders can have some fun at the signing of the SALT agreement.