Gaya APA

Gullett, H, G, H, &, C, R. (1974). Modern Business Management: a Systems and Environmental Approach (1). USA: Mc Graw Hill.

Gaya MLA

Gullett, Herbert, G, Hicks, &, C, Ray. "Modern Business Management: a Systems and Environmental Approach". 1 USA: Mc Graw Hill, 1974. buku.