Winarti, - and A. Cari,, - and I. Suparmi,, - and J. Budiarti,, - and H. Handhika & V. Viyanti, - (2017) IDENTIFICATION OF CONSISTENCY AND CONCEPTUAL UNDERSTANDING OF THE BLACK PRINCIPLE. Taylor & Francis Group. pp. 249-252. ISSN ISBN 978-1-138-05343-4