Steel, Danielle
Friends forever
Corgi, 2013
 Buku Teks SO
Foundation's friends : stories in honour of Isaac Asimov
edited by Martin H. Greenberg
Grafton, 1991
 Buku Teks SO
Duncan, Jane, 1910-
My friends the Mrs. Millers
Ulverscroft, 1965
 Buku Teks SO
Hill, Robert J.
A dictionary of false friends
Macmillan, 1982
 Buku Referensi
Barclay, Glen St. John, 1930-
Friends in high places: Australian-American diplomatic relations since 1945
Oxford University Press, 1985
 Buku Teks SO