s.l. s.n. 1972,
Buku Teks
Ciocca, Pierluigi, author
Clarendon Press, 1996
Buku Teks
edited by Jack M. Guttentag
National Bureau of Economic Research, 1971
Buku Teks
Homer, Sidney, author
Rutgers University Press, 1963
Buku Teks
Tarigan, Ferona Novelina, author
2018
UI - Tesis (Membership)