Garcia, Nohora, author
Emerald, 2018
eBooks
Moonitz, Maurice
New York, N.Y. Garland Publishing 1990,
Buku Teks
Woolf, Emile
McGraw-Hill Book, 1988
Buku Teks
Von Mises, Ludwig, 1881-1973, author
George Braziller, 1956
Buku Teks
Ketz, J. Edward, author
John Wiley & Sons, 2003
Buku Teks