Haurongo: Cooper, Daniel Richard rāua ko Cooper, Martha Elizabeth
He whakaaturanga anō
Rārangi pukapuka
' "Death pays all debts" '. New Zealand Truth. 26 May 1923: 5
'Indicted for murder'. New Zealand Truth. 17 March 1923: 5–6
N.Z. Police Department. Archives. 'Miriam or Marion Cooper – suspicious death'. P1, 1923/430. NA
Treadwell, C. A. L. Notable New Zealand trials. New Plymouth, 1936