Gaya APA

Johnson, W, C, W, ;, W, M. (1987). Refrigeration and air conditioning technology: concepts, procedures, and troubleshooting techniques . USA: delmar publisher.

Gaya MLA

Johnson, William, C., Whitman, ;, William, M.. "Refrigeration and air conditioning technology: concepts, procedures, and troubleshooting techniques". USA: delmar publisher, 1987. Text.