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