Tromp, P.
J.P. Wolters , 1934
Buku Teks
Loomis, Charles P., author
D Van Nostrand , 1965
Buku Teks
Loomis, Charles P.
Prentice Hall Inc., 1957
Buku Teks
Tonnies, Ferdinand
Routledge and Paul, 1955
Buku Teks
Henslin, James M., author
Erlangga, 2007
Buku Teks