APA (7th ed.) Citation

Lock, G. W. (1969). Sisal: Thirty year's sisal research in Tanzania ([2nd ed.). Longmans.

Chicago Style (17th ed.) Citation

Lock, George Winslow. Sisal: Thirty Year's Sisal Research in Tanzania. [2nd ed. London]: Longmans, 1969.

MLA (9th ed.) Citation

Lock, George Winslow. Sisal: Thirty Year's Sisal Research in Tanzania. [2nd ed. Longmans, 1969.