Published in Transactions of The New Zealand Institute, in 1920, in volume 52, pages 35

Published in Transactions of The New Zealand Institute, in 1920, in volume 52, pages 42-44

Published in Transactions of The New Zealand Institute, in 1920, in volume 52, pages 322-415

Published in Transactions of The New Zealand Institute, in 1920, in volume 52, pages 31-32