Algorithms and Data Structures:

http://www.amazon.ca/Introduction-Algorithms-Thomas-H-Cormen...

http://www.amazon.ca/Algorithms-4th-Robert-Sedgewick/dp/0321...

Computer Architecture and Operating Systems:

http://www.amazon.ca/Computer-Architecture-Quantitative-John...

http://www.amazon.ca/Design-Implementation-FreeBSD-Operating...

Mathematics:

http://www.amazon.ca/Calculus-James-Stewart/dp/0495011606

http://www.amazon.ca/Introductory-Statistics-Prem-S-Mann/dp/...

http://www.amazon.ca/Introduction-Mathematical-Cryptography-...

Networking and Systems:

http://www.amazon.ca/Computer-Networks-5th-Andrew-Tanenbaum/...

http://www.amazon.ca/Database-Management-Systems-Raghu-Ramak...

http://www.amazon.ca/Distributed-Systems-Principles-Andrew-T...

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Algorithms and Data Structures:

http://www.amazon.ca/Introduction-Algorithms-Thomas-H-Cormen...

http://www.amazon.ca/Algorithms-4th-Robert-Sedgewick/dp/0321...

Computer Architecture and Operating Systems:

http://www.amazon.ca/Computer-Architecture-Quantitative-John...

http://www.amazon.ca/Design-Implementation-FreeBSD-Operating...

Mathematics:

http://www.amazon.ca/Calculus-James-Stewart/dp/0495011606

http://www.amazon.ca/Introductory-Statistics-Prem-S-Mann/dp/...

http://www.amazon.ca/Introduction-Mathematical-Cryptography-...

Networking and Systems:

http://www.amazon.ca/Computer-Networks-5th-Andrew-Tanenbaum/...

http://www.amazon.ca/Database-Management-Systems-Raghu-Ramak...

http://www.amazon.ca/Distributed-Systems-Principles-Andrew-T...