Bickley, Verner C.
Poems to enjoy; Vol. 1
University of London Press, 1960
Buku Teks SO
Bickley, Verner C.
Poems to enjoy; Vol. 2
University of London Press, 1960
Buku Teks SO
POEMS TO ENJOY
Buku Teks
Encyclopedia of mathematics Vol. 5
Kluwer Academic Publishers, 1995,
Buku Referensi
Excited states; Vol. 5
edited by Edward C. Lim
Academic Press, 1982
Buku Teks SO