edited by Lincoln Barnett
Time Incorporated, 1962
Buku Teks SO
edited by Lincoln Barnett
Time Incorporated, 1963
Buku Teks SO
Baines, Francesca; Challoner, Jack; Macdonald, Fiona; Parker, Steve
Miles Kelly Publishing, 1999
Buku Referensi
Maxwell, Nancy Irwin
Jones & Bartlett Learning, 2014
Buku Teks SO
Peschel, Manfred
Springer-Verlag, 1986
Buku Teks SO