International Law Book. (2006). Penilaian tahap kecekapan (PTK): Aspek kompetensi teras. International Law Book Services.
Chicago Style (17th ed.) CitationInternational Law Book. Penilaian Tahap Kecekapan (PTK): Aspek Kompetensi Teras. Selangor: International Law Book Services, 2006.
MLA (8th ed.) CitationInternational Law Book. Penilaian Tahap Kecekapan (PTK): Aspek Kompetensi Teras. International Law Book Services, 2006.
Warning: These citations may not always be 100% accurate.