Analysis of information sources in references of the Wikipedia article "List of lingua francas" in English language version.
One of the striking external changes in diplomatic practice over the past three decades is the extent to which English has now become indisputably the lingua franca of international diplomacy. A comparison of Satow V and VI quickly establishes the fact. It is remarkable how many passages in the Gore-Booth edition of 1979 are still in French. This has been swept away by the tides of recent history ...