Ingamells, Rex
Longmans , 1960
Buku Teks
Macmillan, 1937
Buku Teks
Vare, Daniele, author
John Murray, 1936
Buku Teks
edited by Rachel Hardage and Sharon Tanenbaum ; photographs by James Wojcik ; illustrations by Kate Francis ; prop styling by Linden Elstran
Time Home Entertainment, 2010
Buku Referensi
Artikel Jurnal