Osho (aka Bhagwan Shree Rajneesh) has other writings on Gurdjieff in his book "Books I Have Loved" (Rajneeshpuram, Oregon: Rajneesh Foundation International, 1985).
"Books I Have Loved" is a listing of 168 recommended books, with a few short sentences, or a few long paragraphs, about each.
[Actually the list is not entirely all "recommended books", one of the books on the list is Marx' "Das Kapital", a work Bhagwan Shree Rajneesh recommends not reading: "There is nothing good in it. It is the exploitation of a great dream. Karl Marx was only a dreamer, not an economist, not at all - just a dreamer; a poet, but a poet of third rate quality [. . .] It is a calamity, but I still mention the book - not that you should read it, but so that you do not. Understand what I have said. Do not read it. You are already in a mess. Enough of it. No need for Das Kapital." (pp. 171-172)]
The full list of the 168 books, numbered according to the 16 chapters, is here:
_http://mind-101.blogspot.co.nz/2010/02/osho-books-i-have-loved.html
The full text of "Books I Have Loved" is available online too, e.g. here:
_http://www.messagefrommasters.com/Beloved_Osho_Books/Personal_Notes/Books_I_Have_Loved.pdf
9 of the 168 books relate to Gurdjieff:
Chapter 2, Number 9: All and Everything by George Gurdjieff
Chapter 2, Number 10: In Search of the Miraculous by P. D. Ouspensky
Chapter 3, Number 2: Tertium Organum by P. D. Ouspensky
Chapter 8, Number 2: A New Model of the Universe by P. D. Ouspensky
Chapter 10, Number 6: Commentaries by Maurice Nicoll
Chapter 10, Number 7: Our Life with Gurdjieff by Thomas de Hartmann & Olga de Hartmann
Chapter 10, Number 9: The Future Psychology of Man by P. D. Ouspensky
Chapter 12, Number 5: Meetings with Remarkable Men by George Gurdjieff
Chapter 16, Number 1: Long Pilgrimage: The Life and Teaching of Sri Govindananda Bharati, known as the ShivaPuri Baba by John G. Bennet