Παραπομπή APA

Ledin, G. (1980). A structured approach to essential basic. San Francisco, Calif: Boyd & Fraser Pub. Co.

Παραπομπή Chicago Style

Ledin, George. A Structured Approach to Essential Basic. San Francisco, Calif: Boyd & Fraser Pub. Co, 1980.

Παραπομπή MLA

Ledin, George. A Structured Approach to Essential Basic. San Francisco, Calif: Boyd & Fraser Pub. Co, 1980.

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