1. The diet of the Australasian Harrier (Circus approximans) in the Manawatu-Rangitikei Sand Country, New Zealand;Baker-Gabb;Notornis,1981
2. Le Busard des roseaux Circus a. aeruginosus en Charente-Maritime (France). 111-Alimentation en période internuptiale;Bavoux;Alauda,1990
3. Microscopic identification of feathers and feather fragments of Palearctic birds;Brom;Bijdragen tot de Dierkunde,1986
4. Vogels in Saef-tinghe in het winterhalfjaar;Castelijns;Het Vogeljaar,1991
5. The diet of Hen Harriers roosting in Wicken Fen;Clarke;Cambridgeshire Bird Rep.,1988