Franklin

MLA

Plant Variety Protection: Hearing, Ninety-first Congress, Second Session ... June 10, 1970. Washington: U.S. Govt. Print. Off., 1970.

APA

(1970). Plant variety protection: hearing, Ninety-first Congress, second session ... June 10, 1970. Washington: U.S. Govt. Print. Off.

Chicago

Plant Variety Protection: Hearing, Ninety-First Congress, Second Session ... June 10, 1970. Washington: U.S. Govt. Print. Off., 1970.