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Southern African osmiine bees: taxonomic notes, two new species, a key to Wainia, and biological observations (Hymenoptera: Anthophila: Megachilidae)KUHLMANN, MICHAEL; GESS, FRIEDRICH W.; KOCH, FRANK; GESS, SARAH K. · Zootaxa · 2011
A Comparative Overview of Flower Visiting by Non-Apis Bees in the Semi-Arid to Arid Areas of Southern AfricaSarah K. Gess and Friedrich W. Gess · Journal of the Kansas Entomological Society · 2004
The Pollen Wasps (Ecology and Natural History of the Masarinae) || ContentsGess, Sarah K. · 1996
The Pollen Wasps (Ecology and Natural History of the Masarinae) || FrontmatterGess, Sarah K. · 1996
The Pollen Wasps (Ecology and Natural History of the Masarinae) || AcknowledgmentsGess, Sarah K. · 1996
The Pollen Wasps (Ecology and Natural History of the Masarinae) || ReferencesGess, Sarah K. · 1996
The Pollen Wasps (Ecology and Natural History of the Masarinae) || IndexGess, Sarah K. · 1996
The Pollen Wasps (Ecology and Natural History of the Masarinae) || CHAPTER 2. BiogeographyGess, Sarah K. · 1996