Tohutoro APA (7th ed.)

Lumsden, k. (1970). Microeconomics: A programmed book (2nd ed.). Prentice-Hall.

Tohutoru Kātū Chicago (17th ed.)

Lumsden, keith. Microeconomics: A Programmed Book. 2nd ed. Englewood Cliffs: Prentice-Hall, 1970.

Tohutoro MLA (9th ed.)

Lumsden, keith. Microeconomics: A Programmed Book. 2nd ed. Prentice-Hall, 1970.