May, Lola June
The Free Press, 1970
Buku Teks
Garstens, Helen L.
Macmillan, 1969
Buku Teks SO
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks SO
Beckmann, Sybilla
Pearson Addison Wesley, 2008
Buku Teks SO
Beckmann, Sybilla
Pearson Addison Wesley, 2008
Buku Teks SO