1. Association of Official Seed Analysts. 1970. Tetrazolium testing handbook for agricultural seeds. Association of Official Seed Analysrs Handbook No. 29, ed. D. F. Grabe.
2. Association of Official Seed Analysts. 2000. Tetrazolium testing handbook. AOSA Publication.
3. Association of Official Seed Analysts. 2000. Rules for Testing Seeds. Proceedings of the Association of Official Seed Analysts 60(2):39.
4. Association of Official Seed Analysts. 1979. Radiographic Analysis of Agricultural and Forest Tree Seed: Handbook No. 31, by E. Belcher and J. Bozzo.
5. Brucher, H. 1948. Eine Schnellme node zur Bestimmung der Keimfahigkeit von Samen Physiologia Plantarum 1:343–358.