Gaya APA
Clark, Ruth Colvin. (2008).
E-learning and the science of instruction .
San Fransisco:
Pfeiffer.
Gaya Chicago
Clark, Ruth Colvin.
E-learning and the science of instruction.
San Fransisco:
Pfeiffer,
2008.
Text.
Gaya MLA
Clark, Ruth Colvin.
E-learning and the science of instruction.
San Fransisco:
Pfeiffer,
2008.
Text.
Gaya Turabian
Clark, Ruth Colvin.
E-learning and the science of instruction.
San Fransisco:
Pfeiffer,
2008.
Print.