സി രാധാകൃഷ്ണന് & C Radhakrishnan. (1987). ആകാശത്തില് ഒരു വിടവ് (1st.). Prabhatham Book House.
Citação norma Chicagoസി രാധാകൃഷ്ണന് and C Radhakrishnan. ആകാശത്തില് ഒരു വിടവ്. 1st. Trivandrum: Prabhatham Book House, 1987.
Citação norma MLAസി രാധാകൃഷ്ണന് and C Radhakrishnan. ആകാശത്തില് ഒരു വിടവ്. 1st. Prabhatham Book House, 1987.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.