Mair Rees 
Y Llawes Goch a”r Faneg Wen [PDF ebook] 
Y Corff Benywaidd a’i Symbolaeth mewn Ffuglen Gymraeg gan Fenywod

This book in the series Gender Studies in Wales uses representations of pregnancy and menstruation as a basis to interpret a wide range of Welsh fiction by women; a perspective of striking novelty in the context of contemporary Welsh.