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
Waldman, Don E.
Industrial organization: theory and practice
Pearson, 2007
 Buku Teks