APA

Hard J. S., . (1967). Identification of destructive Alaska forest insects. [b. m. ]: Pacific Northwest Forest and Range Experiment Station.

Chicago

Hard J S, . 1967. Identification of destructive Alaska forest insects. [b. m. ]: Pacific Northwest Forest and Range Experiment Station.

Harvard

Hard J. S., . (1967). Identification of destructive Alaska forest insects. [b. m. ]: Pacific Northwest Forest and Range Experiment Station.

MLA

Hard J S, . Identification of destructive Alaska forest insects. [b. m. ]: Pacific Northwest Forest and Range Experiment Station. 1967.