1. Leitfaden der Pollenbestimmung, 1. Lieferung;Beug,1961
2. An Introduction to Pollen Analysis;Erdtman,1943
3. Pollen Morphology and Plant Taxonomy. An Introduction to Palynology, 1. Angiosperms;Erdtman,1952
4. The interglacial deposit near Gort;Jessen,1959