Wardlaw, C.W.
Cellular diferentiation in plants and other essays / C W Wardlaw
Manchester University Press , 1970
 Buku Teks
Raven, Peter H., author
Biology of plants
Worth Publisher, 1986
 Buku Referensi
Laetsch, Watson M., author
Plants : basic concept in botany
Little, Brown, 1979
 Buku Teks
Corner, E.J.H.
The life of plants / E.J.H. Corner
The World Publishing Company, 1964
 Buku Teks
Schultz, Theodore W., author
Agriculture in an ucstable economy / Theodore W. Schultz
McGraw-Hill , 1945
 Buku Teks
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