R. Geesink

• Scala Millettiearum
• The Plant Diversity of Malesia
• Thonner's Analytical Key to the Families of Flowering Plants
• A new species of Langsdorffia from New Guinea (Balanophoraceae)
• A synopsis of the genus Swertia (Gent.) in Malesia
• An account of the genus Portulaca in Indo-Australia and the Pacific (Portulacaceae)
• Key to the genera and some species of the SE. Asiatic Leguminosae-Faboideae "Papilionaceae"
• Survey of the Genera of the tribe Millettieae
• Thonner's Analytical Key to the Families of Flowering Plants
• Thonner's Analytical Key to the Families of Flowering Plants (Leiden Botanical)
• Thonners Analytical Key To The Families Of Flowering Plants