- "The day the universe went all funny" by Kenny Felder

it is a great paper can be used as a perfect introduction to special relativity,
 however the thought experiments may not be understood well now but
you can complete reading and then return to them after finishing papers

-"RELATIVITY special and general theory" by Albert Einstein
chapter 1 "Physical Meaning of Geometrical Propositions"
chapter 2 "The System of Co-ordinates"
chapter 3 "Space and Time in Classical Mechanics"
chapter 4 "The Galilean System of Co-ordinates "
chapter 5 "The Principle of Relativity (In the Restricted Sense)"
chapter 6 "The Theorem of the Addition of Velocities Employed in Classical Mechanics "
chapter 7 "The Apparent Incompatibility of the Law of Propagation of Light with the Principle of Relativity "
chapter 8 "On the Idea of Time in Physics "
chapter 9 " The Relativity of Simultaneity  "                                                                                    
chapter 10 "On the Relativity of the Conception of Distance"
chapter 11 "The Lorentz Transformation "
chapter 12 "The Behavior of Measuring-Rods and Clocks in Motion"
chapter 13 "Theorem of the Addition of Velocities. The Experiment of Fizeau"
chapter 14 "The Heuristic Value of the Theory of Relativity "
chapter 15 "General Results of the Theory"
chapter 16 "Experience and the Special Theory of Relativity "
chapter 17 "Minkowski’s Four-Dimensional Spa"
appendix 1 "Simple Derivation of the Lorentz Transformation"
appendix 2 "Minkowski’s Four-Dimensional Space (“World”)"

"Notes on special relativity" by Tatsu Takeuchi
 

Very good lectures explaining special relativity in a simple way also teaches you how
to use space-time diagrams , also it contains solved problems so it will be very useful
for the readers .

 

"theory of special relativity"

Good paper talking about more topics in special relativity and contains some mathematics.
so read it carefully.

 

"special relativity paper" by Albert Einstein  { pdf }

the original paper of special relativity written by Einstein himself
and it contains mathematics, understanding it  finishes most of the course

 

"relation between mass and energy"  { pdf }