Reference:
Sherbourne, C. D., & Stewart, A. L. (1991). The MOS social support survey. Social Science & Medicine, 32(6), 705–714. https://doi.org/10.1016/0277-9536(91)90150-B
Name and number of scales:
1. Tangible; 2. Affection; 3. Positive interaction; 4. Emotional information.