Wetzel, Robert A.
Springer-Verlag, 1990
Buku Teks
Wetzel, Robert G.
Saunders College Publishing, 1983
Buku Teks
Middleton, Robert Gordon, 1908-, author
D. B. Taraporevala Sons & Co., 1969
Buku Teks
Farrel, Robert E.
Academic press, 1993
Buku Teks
Davis, Robert J.
Newnes, 1999
Buku Teks