APA-viite (7. p.)

Hopkins , W. C., & Williams, D. L. (1968). Converting factors for Southern pine products. State University.

Chicago-viite (17. p.)

Hopkins , William C., ja David L. Williams. Converting Factors for Southern Pine Products. Louisiana: State University, 1968.

MLA-viite (9. p.)

Hopkins , William C., ja David L. Williams. Converting Factors for Southern Pine Products. State University, 1968.