De figuur van de vrouw in de troubadourslyriek. Een studie van de hoofse liefde (Proefschrift Rijksuniversiteit Leiden, 11 oktober 1950). ’s Gravenhage, Uitgeverij Excelsior, 1950.

LUCINA SINE CONCUBITU: A LETTER HUMBLY ADDRESS’D TO THE ROYAL SOCIETY. Letter (from the 18th century) “In which Is proved by most Incontestable Evidence, drawn from Reason and Practice, that a Woman may conceive and be brought to Bed without any Commerce with Man.” First printed in 1750.