Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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