ISBN 3-473-46160-1* Don V. Merton, Rodney B. Morris, Ian A. E. Atkinson: "Lek behaviour in a parrot: the kakapo "Strigops habroptilus" of New Zealand.
ISBN 3-455-08384-6* Don V. Merton, Rodney B. Morris, Ian A. E. Atkinson: "Lek behaviour in a parrot: the Kakapo Strigops habroptilus of New Zealand.