Context:

Edward Habsburg references 'Kissinger says in his book on diplomacy' when discussing Ferdinand II and how Richelieu couldn't understand Ferdinand's decisions during the Thirty Years' War period.

Context:

Referenced multiple times - 'Nixon and Kissinger, in their memoirs' and later 'Henry Kissinger tells that story in his memoirs' regarding the Prince Sirik Matak letter - explicit references to Kissinger's memoirs