The first number does not include the prevout, sequence number, or the length byte for the scriptSig. It also uses 65 bytes for the public key (which is correct if it is uncompressed, but compressed keys of 33 bytes are more common now). Correcting it gives 139 + 36 + 4 + 1 + (33 - 65) = 148.
The developer in the third case forgot to include the sequence number, making the result 147 or 148.
The guys at Princeton clearly know best.
So to summarize:
PREVOUT: hash (32 bytes) index (4 bytes)
SCRIPTSIG: length (1 byte) CONTENTS: push opcode (1 byte) signature (71 or 72 bytes) push opcode (1 byte) pubkey (33 bytes for compressed, 65 for uncompressed)
sequence (4 bytes)
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