[edited by] Katherine M. Fortinash, Patricia A. Holoday Worret
St Louis , 2004
Buku Teks SO
Cook, J. Sue
Addison Wesley Publishing, 1987
Buku Teks SO
Rinomhota, A. Shupikai
Churchill Living Stone, 2000
Buku Teks SO
[edited by] Elizabeth M. Varcarolis
Saunders, 2010
Buku Teks SO
[edited by] Elizabeth M. Varcarolis
Saunders, 1990
Buku Teks SO