Gaya APA

Himstreet, W, C., M., I, B, W. (1981). Personal learning aid for business communications . Illinois: Illinois: Dow Jones-Irwin; 1981.

Gaya MLA

Himstreet, William, C.., M., I., Baty,, Wayne. "Personal learning aid for business communications". Illinois: Illinois: Dow Jones-Irwin; 1981, 1981. Text.