Nesbitt, Alexander
Dover Publications , 1957
Buku Teks
Angel, Myer
[publisher not identified], [date of publication not identified]
Buku Teks
Perry, Anne Griffin, author
Mosby, 1994
Buku Teks
Perry, Anne Griffin, author
Mosby , 2004
Buku Teks
The International City Manager's Association, 1947
Buku Teks