Freeman, Harry M.
McGraw-Hill, 1971
Buku Referensi
edited by Herbert F. Lund
McGraw-Hill, 1971
Buku Referensi
Ginting, Perdana
Pustaka Sinar Harapan, 1995
Buku Teks
Freeman, Harry M.
McGraw-Hill, [1995;1995, 1995]
Buku Referensi
edited by Albert Parker
McGraw-Hill, 1978
Buku Referensi