Esser, R. V. (1990). Between spheres: 30 march 1990-9 april 1990, National Museum of Fine Arts, Valletta, Malta / National Museum of Fine Arts, Valletta. [Verlag nicht ermittelbar].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEsser, Raniel Veronika. Between Spheres: 30 March 1990-9 April 1990, National Museum of Fine Arts, Valletta, Malta / National Museum of Fine Arts, Valletta. Valletta: [Verlag nicht ermittelbar], 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEsser, Raniel Veronika. Between Spheres: 30 March 1990-9 April 1990, National Museum of Fine Arts, Valletta, Malta / National Museum of Fine Arts, Valletta. [Verlag nicht ermittelbar], 1990.
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