APA

U.S, Koski A. A. & Foreign Service Institute U.S. (1968). Finnish: graded reader. Washington: Foreign Service Institute; for sale by the Supt. of Docs., U.S. Govt. Print. Off.

Chicago

U.S, Koski Augustus A and Foreign Service Institute U.S. 1968. Finnish: graded reader. Washington: Foreign Service Institute; for sale by the Supt. of Docs., U.S. Govt. Print. Off.

Harvard

U.S, Koski A. A. and Foreign Service Institute U.S. (1968). Finnish: graded reader. Washington: Foreign Service Institute; for sale by the Supt. of Docs., U.S. Govt. Print. Off.

MLA

U.S, Koski Augustus A and Foreign Service Institute U.S. Finnish: graded reader. Washington: Foreign Service Institute; for sale by the Supt. of Docs., U.S. Govt. Print. Off. 1968.