Tolong jelaskan mengenai Sumber dari Periodisitas sifat unsur

Achmad, Hiskia. 1992. Kimia Unsur dan Radiokimia. Bandung: PT Citra Aditya Bakti

Atkins,P.W., T.L. Overton, J.P. Rourke, M.T. Weller, and F.A. Armstrong. 2010. Inorganic Chemistry. Great Britain: Oxford University Press

Heslop, R.B., P.L. Robinson. 1960. Inorganic Chemistry, A Guide to Advanced Study. London: Elsevier Publishing Company

Macmillan. 1957. A Text Book of Inorganic Chemistry. New York: St Martin’s Press

Mackay, K.M., R. Ann Mackay. 1974. Introduction to Modern Inorganic Chemistry 2nd Edition. Kingswood: International Textbook Company Limited

Petrucci, Ralph H – Suminar. 1996. Kimia Dasar, Prinsip dan Terapan Modern. Jakarta: Erlangga

Rosenberg, Jerome L. – Jasjfi. 1992. Seri Buku Schaum Teori dan Soal-Soal Kimia Dasar. Jakarta: Erlangga

Syukri, S. 1999. Kimia Dasar. Bandung: ITB