Hazelkorn, Ellen, author
Palgrave Macmilan, 2011
Buku Teks
Ministry of Education, 1994
Buku Teks
edited by Leo Goedegebuure ... [and others]
Pergamon Press, 1994
Buku Teks
IAU Press , 1996
Buku Teks
Deane E. Neubauer, editor
Routledge, 2012
Buku Teks