Patalas, Ulrich Gregor Enno
Gutersloh Sigbert Mohn Verlag [c.1965]
Buku Teks
Kalliadasis, S., author
Springer, 2012
eBooks
Langman, Larry, author
Garland Pub, 1990
Buku Referensi
Boggs, Joseph M., author
Mayfield, 2000
Buku Teks
editor, J.E.E. Baglin
North-Holland, 1984
Buku Teks