To do a subject search for commentary on these use
International Peace Conference
and International Peace Conference (2nd: 1907: Hague, Netherlands)
Holders of an Oxford SSO can access this journal online via HeinOnline.
They should also consult the International Relations section of the database below
MPEPIL
The Law Bod has the print copy of this encyclopedia at Internat 500 E56c, but the online version has had a number of updates since the work was printed.
"Contemporary" overviews available in the Law Bod include
Wheaton Histoire des progrès du droit des gens en Europe et en Amérique : depuis la paix de Westphalie jusqu'à nos jours
(3rd edn, 1853) Our volumes have been digitized by the google books project so are available as free downloads via link below
Travers Twiss The law of nations considered as independent political communities ..
Calvo (1822-1906) Le droit international théorique et pratique : précédé d'un exposé historique des progrès de la science du droit des gens of which we have the 3rd edn 1880-1881 and the 5th edn 1896 on Level 2 Internat 500 C169.2a5