Annual report 1985 of the Librarian of Congress
Library of Congress , 1986
 Buku Teks SO
Annual report 1985 of the Librarian of Congress
Library of Congress , 1986
 Buku Teks SO
Annual report 1986 of the Librarian of Congress
Library of Conggress, 1987
 Buku Teks SO
Annual report of the librarian of congress 1990
Library of Congress; edited by James W. Mc. Chung
Library of Congress, 1991
 Buku Teks SO
Annual report 1987 of the librarian of congress
Library of Conggress 1988, 1988
 Buku Teks SO