European Organization for Nuclear Research
Suzanne Hurter, 2004
Buku Referensi
Suzanne Hurter, 2004
Buku Referensi
Hazeu, H.A.G.
N.V. Philips Gloeilampenfabrieken, 1971
Buku Teks
Scott-James, R.A.
Longman, 1951
Buku Teks
Eggan, Fred
Chicago Philippine Studies Program University of Chicago [t.th.]
Buku Teks