Bremmelen, R.W. Van
Martinus Nijhoff, 1970
Buku Referensi
Read, H.H., author
ELBS and Macmillan, 1975
Buku Teks
Skinner, Brian J., author
John Wiley & Sons, 1987
Buku Teks
Gilluly, James, author
W.H. Freeman, 1959
Buku Teks
Billings, Marland P., author
Prentice-Hall, 1954
Buku Teks