The World book encyclopedia
World Book, 1992
Buku Referensi
The World book encyclopedia : volume 1
World Book, 1985
Buku Referensi
The World book encyclopedia : volume 3
World Book, 1985
Buku Referensi
The World book encyclopedia : volume 4
World Book, 1985
Buku Referensi
The World book encyclopedia : volume 5
World Book, 1985
Buku Referensi