Maria Elizabeth, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2020
UI - Tugas Akhir
Helen Castle, compiler; Toy Maggie, editor
John Wiley & Sons, 2000
Buku Teks
Troxell, Mary D., author
Gregg Division McGraw-Hill Book Company, 1981
Buku Teks
Edwards-Jones, Imogen, author
Corgi Books, 2006
Buku Teks
Michelle Brachet, author
Ruckus Books, 2014
Buku Referensi