Gaya APA

Eckles, R, W. (1990). Business marketing management : marketing of business products and services . Englewood Cliffs, NJ: Prentice-Hall.

Gaya MLA

Eckles, Robert, W.. "Business marketing management : marketing of business products and services". Englewood Cliffs, NJ: Prentice-Hall, 1990. Buku Umum.