ഉള്ളൂ൪ എസ് പരമേശ്വരയ്യ൪ & Ulloor S Parameswara Iyer. (1951). രത്നമാല (5th.). Ullur Publishers.
Citação norma Chicagoഉള്ളൂ൪ എസ് പരമേശ്വരയ്യ൪ e Ulloor S Parameswara Iyer. രത്നമാല. 5th. Thiruvananthapuram: Ullur Publishers, 1951.
Citação norma MLAഉള്ളൂ൪ എസ് പരമേശ്വരയ്യ൪ e Ulloor S Parameswara Iyer. രത്നമാല. 5th. Ullur Publishers, 1951.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.