1. CHROMOSOME STUDIES ON FERNS
2. E. B. Copeland(1947 ).Genera Filicum. Waltham, Mass.
3. H. B. Dobbie(1951 ).New Zealand Ferns. 4th ed. Revised by Marguerite Crookes.
4. I. Manton(1950 ).Problems of Cytology and Evolution in the Pteridophyta. Cambridge.