Speight, Charlotte F., author
McGraw-Hill, 2004
Buku Teks
Triplett, Kathy, author
Lark Books, 1997
Buku Referensi
Morley-Fletcher, Hugo, editor
Chartwell Book, 1997
Buku Referensi
Ayudhia Rachmawati, author
2020
UI - Tesis Membership
Nelson, Glenn C., author
Rinehart and Winston, 1960
Buku Teks