APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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