Rees, Yvonne, author
Page One Publishing, 2001
Buku Referensi
Harrington-Mackin, Deborah, author
Tian Xia Wen Hua, 1995
Buku Teks
Hawkins, Paula, author
Doubleday, 2017
Buku Teks
Hawkins, Paula, author
Noura Books, 2017
Buku Teks
McGraw-Hill, 1961
Buku Referensi