Kennedy, Paul M
Preparing for the twenty-first century / Paul Kennedy.
Vintage Books, 1993
 Buku Teks
Newell, Michael W., author
Preparing for the project management professional (PMP) certification exam
American Management Association, 2005
 eBooks
Ag. Bambang Setiyadi, author
Teaching language skills : preparing materials and selecting techniques
Graha Ilmu, 2018
 Buku Teks
Preparing for the new mollennium: the case for using marketing strategies
 Artikel Jurnal
Record, Matthew, author
Grolier business library: preparing a business plan
Glorier International, 1999
 Buku Referensi