Piper, C. V., & Beattie, R. K. (1901). The flora of the Palouse region: Containing descriptions of all the spermatophytes and pteridophytes known to grow wild in the area within 35 kilometers of Pullman, Washington. The Washington Agricultural College and School of Science.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Piper, Charles V., và R. Kent Beattie. The Flora of the Palouse Region: Containing Descriptions of All the Spermatophytes and Pteridophytes Known to Grow Wild in the Area Within 35 Kilometers of Pullman, Washington. Pullman: The Washington Agricultural College and School of Science, 1901.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Piper, Charles V., và R. Kent Beattie. The Flora of the Palouse Region: Containing Descriptions of All the Spermatophytes and Pteridophytes Known to Grow Wild in the Area Within 35 Kilometers of Pullman, Washington. The Washington Agricultural College and School of Science, 1901.