Ritchie, Leitch.
A view of the opium trade, historical, moral, and commercial. (London : Smith, Elder and Co., 1843).
https://books.google.ch/books?id=KbVjAAAAcAAJ&pg=PA1&lpg=PA1&dq=
Ritchie,+Leitch.+A+view+of+the+opium+trade,+historical,+moral,+and+com
mercial.&source=bl&ots=WyJj16by5y&sig=ACfU3U1x8EBwJ9Mxua8VPIM
niZclZ0Ax3Q&hl=de&sa=X&ved=2ahUKEwjP55v46NHiAhUqzqYKHYBcBR
0Q6AEwAnoECAUQAQ#v=onepage&q=Ritchie%2C%20Leitch.%20A%20view
%20of%20the%20opium%20trade%2C%20historical%2C%20moral%2C%
20and%20commercial.&f=false.
(RitL2)
Economics and Trade
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History : China - Europe : England