APA

Ferguson R. H., Kingsley N. P., . (1972). The Timber Resources of Maine. : .

Chicago

Ferguson Roland H, Kingsley Neal P, . 1972. The Timber Resources of Maine. : .

Harvard

Ferguson R. H., Kingsley N. P., . (1972). The Timber Resources of Maine. : .

MLA

Ferguson Roland H, Kingsley Neal P, . The Timber Resources of Maine. : . 1972.