Schubert, Glendon, author
Scott, Foresman, 1965
Buku Teks
Schubert, Glendon, author
Scott,Foresman and Company, 1974
Buku Teks
Brenncke, Martin, author
Intersentia, 2018
eBooks
McWhinney, Edward, author
Martinus Nijhoff, 1986
Buku Teks
Cambridge University Press, 2019
eBooks