(1991). 1991 collective bargaining agreement survey. Personnel Management Association of the Philippines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र1991 Collective Bargaining Agreement Survey. Manila: Personnel Management Association of the Philippines, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्र1991 Collective Bargaining Agreement Survey. Personnel Management Association of the Philippines, 1991.
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