Ryans, John K.
China, the USSR and Eastern Europe : a US trade perspective / edited by John K. Ryans, Jr, Anant R. Negandhi and James C. Baker
Ohio Kent State University Press , 1974
 Buku Teks
Parker, Earl R.
Materials data book for engineers and scientists / Earl R. Parker
McGraw-Hil Book Company, 1967
 Buku Teks
Parker, Earl R.
Materials data book for engineers and scientists/ Earl R. Parker
McGraw-Hill, 1967
 Buku Teks
Davis, H.W.C.
Medieval Europe / H. W. C. Davis
Oxford University Press, 1960
 Buku Teks
Wolf, Eric R.
Europe and the people without history : with a new preface / Eric R. Wolf
University of California Press, 1997
 Buku Teks