Skousen, Philip L., author
McGraw-Hill, 2011
Buku Teks
edited by E.U. Condon and Hugh Odishaw
McGraw-Hill, 1967
Buku Referensi
edited by E.U. Condon and Hugh Odishaw
McGraw-Hill, 1958
Buku Referensi
edited by Diane Bridson and Leonard Forman
Royal Botanic Gardens, 1992
Buku Referensi
Skidmore-Roth, Linda, author
Mosby/Elsevier, 2009
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