Context:

Explicitly recommended as a book: 'there's a sort of Library of America two volume edition of war reporting from Vietnam and if anybody's never read about the Vietnam War and is interested in the writing about it, the war reporting is better than any history book'

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Described as 'an ex-marine called Philip Caputo who later wrote a brilliant book about Vietnam' - this is an explicit reference to a book, likely his famous memoir 'A Rumor of War'

Context:

Referenced as 'Nixon and Kissinger, in their memoirs, both say, we didn't let South Vietnam down' - explicit reference to Nixon's memoirs discussing Vietnam policy