Habermas, Jurgen
Theory and Practice
Heinemann, 1974
 Buku Teks
Jones, Samuel B., 1933-
Plant systematics
McGraw-Hill, 1986
 Buku Teks
Jones, Samuel B., 1933-
Plant systematics
McGraw-Hill, 1979
 Buku Teks
Ontogeny and systematics
edited by C.J. Humphries
Columbia University Press, 1988
 Buku Teks
Pollack, Solomon L.
Decision tables : theory and practice
John Wiley & Sons, 1971
 Buku Teks