Morgan, Derek
Cavendish, 2001
Buku Teks
Johnson, Rob
Jones & Bartlett Learning, 2015
Buku Teks
edited by Peggy L. Chinn
Maryland Aspen, 1986
Buku Teks
edited by Bankole Osita Awuzie, Peter McDermott
Springer Nature, 2019
eBooks
Volkmar, Fred R.
Woodbine House, Bethesda, MD, 2004
Buku Teks SO