(1998). Fifteen years of leadership in educational publishing. Philippine Daily Inquirer.
Chicago-referens (17:e uppl.)"Fifteen Years of Leadership in Educational Publishing." Philippine Daily Inquirer 1998.
MLA-referens (9:e uppl.)"Fifteen Years of Leadership in Educational Publishing." Philippine Daily Inquirer, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.