Wright, Katherine, author
Geddes & Grosset, 2004
Buku Teks
Bernstein, Lewis
Norwalk Appletton century crofts , 1985
Buku Teks
Gillam, Tony, author
Palgrave Macmillan, 2018
Buku Teks
Burnard, Philip, author
Chapman&Hall,, 1995
Buku Referensi
Potter, Patricia A., author
Mosby , 1998
Buku Teks