George Routledge and Sons, 1969
Buku Referensi
George Routledge and Sons, 1969
Buku Referensi
Decker, Randall E.
Little, Brown and Company, 1984
Buku Teks
Karsemeijer, J.
t.t Uitgevers-Maatschappij Holland 1934
Buku Teks
Decker, Randall E.
Little, Brown And Company, 1980
Buku Teks