pengantar, Sampoerno Samingoen ; perekam foto, Subroto S.M., Y. Eka Suprihadi ; penterjemah, A.M. Hidayati = The traditional architecture album of North Sumatera / introduction, Sampoerno Samingoen ; photographer, Subroto S.M., Y. Eka Suprihadi ; translater , A.M. Hidayati