Justice Cruz’s approach focuses on the essential "rules of action" that are binding upon civilized states. His work meticulously defines the boundaries between international and domestic law, which is crucial for passing the Philippine Bar Exam.
For those interested in accessing Isagani Cruz's book, "Public International Law," in PDF format, several options are available:
: A vital concept where international law becomes part of a state's domestic law without requiring specific legislative action, provided it does not irreconcilably conflict with the constitution. Essential Principles :