Hutahaean, E., author
"Jakarta: Gramedia, 1980",
Buku Teks
Ayres, Frank, 1901-1994, author
Erlangga, 1998
Buku Teks
Ayres, Frank, 1901-1994, author
Erlangga, 1993
Buku Teks
Ayres, Frank, 1901-1994, author
Erlanngga, 1998
Buku Teks
Courant, R., author
Blackie and Son Ltd., 1960
Buku Teks