Bedjaoui, Mohammed (1991), International Law: Achievements and Prospects, Martinus Nijhoff Publishers, pp. 51–, ISBN92-3-102716-6, https://books.google.com/books?id=jrTsNTzcY7EC&pg=PA51: "The Treaty of Friendship of 8 August 1949 between Bhutan and India is an example of the creation of a protected State, Bhutan, with a quite loose relationship to the protecting State, India. By the terms of this Treaty of Friendship, Bhutan agreed to follow the guidance given by India in so far as external relations were concerned. India was not granted the power to exercise diplomatic rights on behalf of Bhutan and this way Bhutan remained in charge of its foreign policy."
Savada, Andrea Matles; Harris, George Lawrence (1993) Nepal and Bhutan: country studies. Federal Research Division, გვ. 332. „The specter of renewed Chinese claims to Bhutan, Sikkim, and Nepal was raised after China published a map in 1961 that showed alterations of traditional Sino-Bhutanese and other Himalayan borders in Beijing's favor“
