Germain, ST.
Triad Publishers Pty.Ltd, 1993
Buku Teks
Riordan, Rick
Penguin Random House, 2017
Buku Teks
Germain, Carel Bailey
Columbia Universary Press, 1991
Buku Teks
Meissner, Rudolf
Verlag Sermann, 1941
Buku Teks
Magnus, Manya
Jones & Bartlett Learning, 2016
Buku Teks