- Zondag, R. 1982. Insects of the exotic forests of the central North Island. New Zealand Entomology 7276-280.
- Zondag, R. 1966. Forest entomology in New Zealand FAO/IUFRO Symposium on internationally dangerous forest diseases and insects Oxford, 20-29 July 1964 Volume 1, Meeting II-III. ii + 8 p..
- Zondag, R. 1977. Xyleborus truncatus Erichson (Coleoptera: Scolytidae). 4 p..
- Zondag, R. 1965a. Entomology. Report of the Forest Research Institute, New Zealand. 62 p.
- Zondag, R. 1965b. Insect pests of forest nurseries and young plantations in New Zealand . International Congress of Entomology, Proceedings, London 1964, 12:674-675.
- Zondag, R. 1968. Entomological problems in New Zealand forest . New Zealand Ecological Society, Proceedings 15:10-14.
- Zondag, R. 1976a. Phleosinus cupressi Hopkins (Coleoptera: Scolytidae), cypress bark beeetle. Forest Service, Forest and Timber Insects of New Zealand 3. 4 p. [pages not numbered].
- Zondag, R. 1976b. Pteromalid parasites for the control of Hylastes ater. Part 1. Breeding and releases until May 1976. New Zealand Forest Service, Forest Research Institute, Entomology Report 44 (unpublished).
- Zondag, R. 1979. Breeding of the clerid Thanasimus formicarius for the control of the bark beetles Hylastes ater and Hylurgus ligniperda in New Zealand . New Zealand Journal of Forest Science 9:125-132.
- Zondag, R., J. Bain, and W. Faulds. 1976. Pteromalid parasites for the contral of Hylastes ater. Part 2. The breeding from May to end of October 1976. New Zealand Forest Service, Forest Research Institute, Entomology Report 44 (unpublished).