APA
Villiger Mark E,, . (2009). Commentary on the 1969 Vienna convention on the law of treaties. Boston: Martinus Nijhoff Publishers.
Chicago
Villiger Mark E,, . 2009. Commentary on the 1969 Vienna convention on the law of treaties. Boston: Martinus Nijhoff Publishers.
Harvard
Villiger Mark E,, . (2009). Commentary on the 1969 Vienna convention on the law of treaties. Boston: Martinus Nijhoff Publishers.
MLA
Villiger Mark E,, . Commentary on the 1969 Vienna convention on the law of treaties. Boston: Martinus Nijhoff Publishers. 2009.