- Chrystal, R. N. 1937. Insects of British Woodlands. F. Warne Co., London 338 p. pp..
- Chrystal, R. N. 1922. Drycoetes alni (Georg): an alder bark beetle (Scolytidae) new to Scotland . Royal Scottish Arboricultural Society, Transactions 36:253.
- Chrystal, R. N. 1928. The occurence of Pityogenes bidentatus, Herbst, the two-toothed pine-beetle, on frosted Douglas-fir . Forestry 2:28-29.
- Chrystal, R. N. 1931. The pine shoot beetle, Myelophilus piniperda L. in nursery plants. Scottish Forestry Journal 45(1):84, pl. 3.
- Chrystal, R. N. 1935. Bark-beetle outbreaks and their control: a review of some recent literature . Forestry 9:124-131.
- Chrystal, R. N. 1949a. Insect pests in trees (and in converted timber) . Timber News 57108-109, 146-173.
- Chrystal, R. N. 1949b. The barkbeetle problem in Europe and North America . Forestry Abstracts 11:3-12.
- Chrystal, R. N. 1956. Report on a survey of the forest insects of Cyprus, June 1954-July 1955. Unpublished report. 41 p.
- Day, W. R., and R. N. Chrystal. 1928. Damage by late frost on Douglas fir, Sitka spruce and other conifers. With a note on the occurrence of Pityogenes bidentatus Herbst, on frosted Douglas fir. Forestry 2:19-30, 1 pl.