Gaya APA

Bittel, L, R., Newstrom, J, W. (1990). What every supervisor should know (6th edition). New York: McGraw-Hill Publishing Co..

Gaya MLA

Bittel, Lester, R.., Newstrom, John, W.. "What every supervisor should know". 6th edition New York: McGraw-Hill Publishing Co., 1990. BUKU.