Παραπομπή APA

Lillian & Frankel, G. (1953). Activities to lern by: What to do with your preschooler. OTP.

Παραπομπή Chicago Style

Lillian και Godfrey Frankel. Activities to Lern by: What to Do with Your Preschooler. OTP, 1953.

Παραπομπή MLA

Lillian και Godfrey Frankel. Activities to Lern by: What to Do with Your Preschooler. OTP, 1953.