@BOOK{NAP9220, title = "A Framework and Principles for International Comparative Studies in Education", doi = "10.17226/9220", url = "https://nap.nationalacademies.org/catalog/9220/a-framework-and-principles-for-international-comparative-studies-in-education", year = 1990, publisher = "The National Academies Press", address = "Washington, DC" }