Παραπομπή APA

Không rõ. (2001). Product Planning and Development. Youth PublishingHouse.

Παραπομπή Chicago Style

Không rõ. Product Planning and Development. Youth PublishingHouse, 2001.

Παραπομπή MLA

Không rõ. Product Planning and Development. Youth PublishingHouse, 2001.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.