Tolong jelaskan mengenai Karya dari Joseph Buttinger

"In the Twilight of Socialism" (1953)

"The Smaller Dragon -- A Political History of Vietnam" (1958)

"Vietnam: A Dragon Embattled" (1967)

"Vietnam: A Political History" (1968)

"A Dragon Defiant: A Short History of Vietnam" (1972)

"Vietnam: The Unforgettable Tragedy" (1977).