Taylor, Verta
Feminist frontiers
McGraw-Hill, 2009
Buku Teks
Hoyle, Fred
Frontiers of astronomy
Harper & Brothers, 1955
Buku Teks
Morrison, David
Frontiers of astronomy
Saunders College, 1990
Buku Teks
Silverberg, Robert
Frontiers in archeology
Chilton Book, 1966
Buku Teks
McCoubrey, Hilaire
International organizations and civil wars
Brookfield Dartmouth , 1995
Buku Teks