Coba jelasin bersambung dari Petrus Josephus Zoetmulder dalam bahasa jawa dong

1971 – ‘The Wajang as a Philosophical Theme’, Indonésia 12:85-96. (Cornell Modern Indonésia Project).

1953-'Kedudukan Basa Djawa', ing: Pasarasehan Basa Djawa padha Tanggal 14/15 Novèmber 1953 ing Gedung Agung Jogjakarta, Jogjakarta: Tjabang Pérangan Basa Djawatan Kebudajaan Kementerian P.P. & K.

1957-'Literarische Yantras', Makalah kang dipersembaké marang "Twenty-Fifth International Congress of Orientalists", München, 28 Agustus-4 September 1957.

1964-'The Old Javanese Poet and his Craft', Makalah kang dipersembahaké marang "Twenty-Sixth International Congress of Orientalists", New Delhi 4-10 Januari 1964

1967-'The Cultural Background of Indonésian Politics', University of South Carolina, Columbia.