The 1990 World Book Year Book,
World Book, 1990, 576 p. : ill., 0-7166-0490-6.
.
The 1990 World Book Year Book.
Chicago etc.: World Book, 1990, 576 p. : ill., 0-7166-0490-6.
(1990)
The 1990 World Book Year Book,
Chicago etc.: World Book, 576 p. : ill., 0-7166-0490-6
(1990).
The 1990 World Book Year Book. The Annual Supplement to The World Book Encyclopedia : A Review of the Events of 1989. Chicago etc.: World Book, 576 p. : ill..