editor, Rudolf Walther
Pergamon Press, 1972
Buku Referensi
Crispin, Frederic Swing, author
Bruce Pub. Co., 1945
Buku Teks
Crispin, Frederic Swing, author
Bruce Pub. Co., 1961
Buku Referensi
Sybil P. Parker, editor in chief
McGraw-Hill, 1994
Buku Referensi
Sybil P. Parker, editor in chief
McGraw-Hill, 1984
Buku Referensi