Kim, Kyu-jung
Guko Gyokwaseo jakphum Ilgi = Jung 1 si
Changbi Publishers, 2010
 Buku Teks
Park, Jong-ho
Guko kyoswaso jakphum ilsi : jung 1 suphil
Changbi , 2011
 Buku Teks
Seong Ha Seong
Gugeosigane Sosolilki
 Buku Teks
Guko saenghwal
by Lee Sam Hyong ... [and others]
Joongang kyoyook jin heung yeongooso, 2003
 Buku Teks
Lee, Ki-mun
Donga sae guko sajon
Seoul Doosan Dong a, 2003
 Buku Referensi