S.l. : s.n. 19-,
Buku Teks
Christoper, author
Dinastindo, 1992
Buku Teks
Simpson, Alan
Tech Publications , 1995
Buku Teks
Larsen, Jen, author
HarperTeen, an imprint of HarperCollinsPublishers, 2015
Buku Teks
Mangan, James T., author
Prentice-Hall, 1963
Buku Teks