The terrible twosome :
California five-spined ips, western pine beetle.
APA Citation
California. Division of Forestry. (1961). The terrible twosome: California five-spined ips, western pine beetle. Sacramento, Calif.: California Division of Forestry.
MLA Citation
California. Division of Forestry. The Terrible Twosome: California Five-spined Ips, Western Pine Beetle. Sacramento, Calif.: California Division of Forestry, 1961.
Warning: These citations may not always be complete (especially for serials).