Journal of youth services in libraries
American Library Association, 2018
 Majalah, Jurnal, Buletin
Lovelock, Christopher H.
Services marketing
Pearson Prentice Hall, 2001
 Buku Teks
Lovelock, Christopher H.
Services marketing
Prentice-Hall, 2000
 Buku Teks
Lovelock, Christopher H.
Services marketing
Prentice-Hall, 1960
 Buku Teks
Zeithaml, Valarie A.
Services marketing
The McGraw-Hill , 1996
 Buku Teks