Tham khảo Quản_bào

  1. Peter A. Raven, Ray F. Evert, Susan E. Eichhorn (1999). Biology of Plants. W.H. Freeman and Company. tr. 576–577. ISBN 1-57259-611-2
  • Wilson, K. & D.J.B. White (1986). The Anatomy of Wood: its Diversity and variability. Stobart & Son Ltd, London