Bucureti Directia Centrala De Statistica, Republica Populara Romania 1960,
Buku Teks
edited by Irene Yeung
Government Information Office, 2002
Buku Referensi
Stoica, Georgeta
Bacuresti Editura Meridiane 1989,
Buku Teks
Universitas Riau,
Majalah, Jurnal, Buletin
Trebici, Vladimir
Meridiane Publishing House, 1976
Buku Teks