Anima, Nid
Ilocandia: land of contrasts and contradictions / Nid Anima
Omar Publications, 1976
 Buku Teks SO
Sung, Betty Lee
The story of the Chinese in America / Betty Lee Sung
Collier Books, 1967
 Buku Teks SO
Leon, Hector S. De
Textbook on agrarian reform and taxation (with cooperatives) / by Hector S. de Leon
Rex Book Store, 1979
 Buku Teks
Montemayor, Jeremias U.
The Philippine agrarian reform program
Rex Book Store, 1976
 Buku Teks SO
Taxation in Australia agenda for reform
by R.I. Downing ... [and others]
Melbourne University Press , 1964
 Buku Teks