Gates, Bill
The road ahead
Viking Press, 1995
Buku Teks SO
Looking ahead: 20 in their 20s
Artikel Jurnal
Murray, Maggie
Streets ahead: student's book 2
Oxford University Press, 1994
Buku Teks
Sarnoff, David
Looking ahead : the papers of David Sarnoff
McGraw-Hill, 1968
Buku Teks
Liu, Pai-Yu
Flames ahead / Liu Pai-Yu
Foreign Language , 1954
Buku Teks