O`Connor, Paul, 1978-, author
Routledge, Taylor & Francis Group, 2018
Buku Teks
Forign English Publishing House, 1957
Buku Teks
Avyzius, Jonas
Progress, 1974
Buku Teks
Humphrey, Carolyn J. , author
An Aspen , 1998
Buku Teks
Becker, Norman, author
McGraw-Hill, 2011
Buku Teks