APA (7th ed.) Citation

Air Mail Society of New Zealand & Walker, D. A. (1986). The Air mails of New Zealand. The Air Mail Society of New Zealand.

Chicago Style (17th ed.) Citation

Air Mail Society of New Zealand and Douglas A. Walker. The Air Mails of New Zealand. Christchurch, N.Z.: The Air Mail Society of New Zealand, 1986.

MLA (9th ed.) Citation

Air Mail Society of New Zealand and Douglas A. Walker. The Air Mails of New Zealand. The Air Mail Society of New Zealand, 1986.