Washington : Pan American Union, General Secretariet of the Organization of American States
Majalah, Jurnal, Buletin
edited by Michael Gorman, Paul W. Winkler
American Library Association, 1978
Buku Referensi
Gilbert, Dorothy B., author
R.R.Bowker, [date of publication not identified]
Buku Teks
Trump, Ivanka, 1981-, author
Penguin, 2017
Buku Teks
Domhoff, G. William, author
McGraw-Hill, Higher Education, 2010
Buku Teks SO