Espino, A. (2004). Balik bayan: Solo piano : based on the Philippine folk tune "Okaka". UP College of Music.
Lua i Stíl Chicago (17ú heag.)Espino, Augusto. Balik Bayan: Solo Piano : Based on the Philippine Folk Tune "Okaka". Quezon City: UP College of Music, 2004.
Lua MLA (9ú heag.)Espino, Augusto. Balik Bayan: Solo Piano : Based on the Philippine Folk Tune "Okaka". UP College of Music, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.